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What is Robots.txt File? What are the Different types of bots or Web Crawlers?

Robots.txt is a standard text file is used for websites or web applications to communicate with web crawlers (bots). It is used for the purpose of web indexing or spidering. It will help the website that ranks as highly as possible by the search engines.





1. What is robots.txt?

Robots.txt is a standard text file that is used for websites or web applications to communicate with web crawlers (bots). It is used for web indexing or spidering. It will help the site that ranks as highly as possible by the search engines.

The robots.txt file is an integral part of the Robots Exclusion Protocol (REP) or Robots Exclusion Standard, a robot exclusion standard that regulates how robots will crawl the web pages, index, and serve that web content up to users.

Web Crawlers

Web Crawlers are also known as Web Spiders, Web Robots, WWW Robots, Web Scrapers, Web Wanderers, Bots, Internet Bots, Spiders, user-agents, Browsers. One of the most preferred Web Crawler is Googlebot. This Web Crawlers are simply called as Bots.

The largest use of bots is in web spidering, in which an automated script fetches, analyzes, and files information from web servers at many times the speed of a human. More than half of all web traffic is made up of bots.

Many popular programming languages are used to created web robots. The Chicken Scheme, Common Lisp, Haskell, C, C++, Java, C#, Perl, PHP, Python, and Ruby programming languages all have libraries available for creating web robots. Pywikipedia (Python Wikipedia bot Framework) is a collection of tools developed specifically for creating web robots.

Examples of programming languages based open-source Web Crawlers are

  • Apache Nutch (Java)
  • PHP-Crawler (PHP)
  • HTTrack (C-lang)
  • Heritrix (Java)
  • Octoparse (MS.NET and C#)
  • Xapian (C++)
  • Scrappy (Python)
  • Sphinx (C++)

2. Different Types of Bots

a) Social bots

Social Bots have a set of algorithms that will take the repetitive set of instructions in order to establish a service or connection works among social networking users.

b) Commercial Bots

The Commercial Bot algorithms have set off instructions in order to deal with automated trading functions, Auction websites, and eCommerce websites, etc.

c) Malicious (spam) Bots

The Malicious Bot algorithms have instructions to operate an automated attack on networked computers, such as a denial-of-service (DDoS) attacks by a botnet. A spambot is an internet bot that attempts to spam large amounts of content on the Internet, usually adding advertising links. More than 94.2% of websites have experienced a bot attack.

d) Helpful Bots

The bots will helpful for all customers and companies and make Communication over all the Internet without having to communicate with a person. for example, e-mails, chatbots, and reminders, etc.

Different Types of Bots

3. List of Web Crawlers or User-agents

List of Top Good Bots or Crawlers or User-agents

Google Mobile Adsense
Google Plus Share
Google Feedfetcher
Bingbot Mobile
Sogou Spider
Facebook External Hit
Soso Spider

List of Top Bad Bots or Crawlers or User-agents

Web Downloader
HTTrack Website Copier/3.x
Black Hole
Crescent Internet ToolPak HTTP OLE Control v.1.0

Note:- If you need more names of Bad Bots or Crawlers or User-agents with examples in the TwinzTech Robots.txt File.

4. Basic format of robots.txt

User-agent: [user-agent name]
Disallow: [URL string not to be crawled]

The above two lines are considered as a complete robots.txt file. one robots file can contain multiple lines of user agents names and directives (i.e., allows, disallows, crawl-delays, and sitemaps, etc.)

It has multiple sets of lines of user agent’s names and directives, which are separated by a line break for an example in the below screenshot.

user-agent are separated by a line break and its Comment

Use # symbol to give single line comments in robots.txt file.

5. Basic robots.txt examples

Here are some regular robots.txt Configuration explained in detail below.

Allow full access

User-agent: *


User-agent: *
Allow: /

Block all access

User-agent: *
Disallow: /

Block one folder

User-agent: *
Disallow: /folder-name/

Block one file or page

User-agent: *
Disallow: /page-name.html/

6. How to create a robots.txt file

Robots files are in text format we can save as text (.txt) Formats like robots.txt in editors or environments. See the example in the below screenshot.

robots file save as in .txt formats

7. Where we can place or find the robots.txt file

The website owner wishes to give instructions to web robots. They place a text file called robots.txt in the root directory of the webserver. (e.g.,

This text file contains the instructions in a specific format (see examples below). Robots that choose to follow the instructions try to fetch this file and read the instructions before fetching any other file from the website. If this File doesn’t exist, web robots assume that the web owner wishes to provide no specific instructions and crawl the entire site.

8. How to check my website robots.txt on the web browser

Go to web browsers and enter the domain name in the address bar of the browser and add forward slash like /robots.txt and enter and see the file details ( See the example in the below screenshot.

check website robots.txt on the web browser

9. Where we can submit a robots.txt on Google Webmasters (search console)

Follow the below example screenshots and submit the robots.txt on webmasters (search console).

1. Add a new site property on search console-like as below screenshot (if you have a property on search console leave the first point and move to second).

submiting robots.txt on google search console

2. Click your site property and see the new options on screen and select the crawl options on the left side is as shown in the below screenshot.

submiting robots.txt on google search console

3. Click the robots.txt tester option in crawl options is as shown in the below screenshot.

submiting robots.txt on google search console

4. After clicking the robots.txt tester option in crawl options, we can see the new options on screen and click the submit button is as shown in the below screenshot.

submiting robots.txt on google search console

10. Examples of how to block specific web crawler from a specific page/folder

User-agent: Bingbot
Disallow: /example-page/
Disallow: /example-subfolder-name/

The above syntax tells only Bing crawler (user-agent name Bingbot) not to crawl the page that contains the URL string and not to crawl any pages that contain the URL string

11. How to allow and disallow a specific web crawler in robots.txt

# Allowed User Agents
User-agent: rogerbot
Allow: /

The above syntax tells to Allow the user-agent name called rogerbot for crawling/reading the pages on the website.

# Disallowed User Agents
User-agent: dotbot
Disallow: /

The above syntax tells to Disallow the user-agent name called dot bot for not crawling/reading the pages on the website.

12. How To Block Unwanted Bots From a Website By Using robots.txt File

Due to security we can avoid or block unwanted bots using the robots.txt file. The List of unwanted bots is blocking by the help of robots.txt File.

# Disallowed User Agents

User-agent: dotbot
Disallow: /

User-agent: HTTrack Website Copier/3.x
Disallow: /

User-agent: Teleport
Disallow: /

User-agent: EmailCollector
Disallow: /

User-agent: WebZIP
Disallow: /

User-agent: WebCopier
Disallow: /

User-agent: Leech
Disallow: /

User-agent: WebSnake

The above syntax tells to Disallow the unwanted bots or user-agents names for not crawling/reading the pages on the website.

See the below screenshot with examples

Disallow the unwanted bots

13. How to add Crawl-Delay in robots.txt file

In the robots.txt file, we can set Crawl-Delay for specific or all bots or user-agents

User-agent: Baiduspider
Crawl-delay: 6

The above syntax tells Baiduspider should wait for 6 MSC before crawling each page.

User-agent: *
Crawl-delay: 6

The above syntax tells all user-agents should wait for 6 MSC before crawling each page.

14. How to add multiple sitemaps in robots.txt file

The examples of adding multiple sitemaps in the robots.txt file are


The above syntax tells us to call out multiple sitemaps in the robots.txt File.

15. Technical syntax of robots.txt

There are five most common terms come across in a robots file. The syntax of robots.txt files includes:

User-agent: The command specifies the name of a web crawler or user-agents.

Disallow: The command giving crawl instructions (usually a search engines) to tell a user-agent not to crawl the page or URL. Only one “Disallow:” line is allowed for each URL.

Allow: The command giving crawl instructions (usually a search engines) to tell a user-agent to crawl the page or URL. It is only applicable for Googlebot.

Crawl-delay: The command should tell how many milliseconds a crawler (usually a search engines) should wait before loading and crawling page content.

Note: that Googlebot does not acknowledge this command, but crawl rate can be set in Google Search Console.

Sitemap: The command is Used to call out the location of any XML sitemaps associated with this URL.

Note: This command is only supported by Google, Ask, Bing, and Yahoo search engines.


Here we can see the Robots.txt Specifications.

Also Read : How to Flush the Rewrite URL’s or permalinks in WordPress Dashboard?

16. Pattern-matching in robots.txt file

All search engines support regular expressions that can be used to identify pages or subfolders that an SEO wants excluded.

With the help of Pattern-matching in the robots.txt File, we can control the bots by the two characters are the asterisk (*) and the dollar sign ($).

1. An asterisk (*) is a wildcard that represents the sequence of characters.
2. Dollar Sign ($) is a Regex symbol that must match at the end of the URL/line.

17. Why is robots.txt file important?

Search Engines crawls robots.txt File first, and next to your website, Search Engines will look at your robots.txt File as instructions on where they are allowed to crawl or visit and index or save on the search engine results.

Robots.txt files are very useful and play an important role in the search engine results; If you want search engines to ignore or disallow any duplicate pages or content on your website do with the help of robots.txt File.

Helpful Resources:

1. What is the Difference Between Absolute and Relative URLs?

2. 16 Best Free SEO WordPress plugins for your Blogs & websites

3. What is Canonicalization? and Cross-Domain Content Duplication

4. What is On-Site (On-Page) and Off-Site (Off-Page) SEO?

5. What is HTTPS or HTTP Secure?

We are an Instructor, Modern Full Stack Web Application Developers, Freelancers, Tech Bloggers, and Technical SEO Experts. We deliver a rich set of software applications for your business needs.

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Digital Marketing

How competitive is Sydney for SEO ranking?

Importance of SEO in the Digital Landscape of Sydney. SEO is as essential as a good flat white in the digital age to a Sydney morning.




search engine optimization concept revealing ranking factors

Imagine SEO as the digital equivalent of Sydney’s bustling Pitt Street Mall. Just as businesses vie for prime real estate in this shopping mecca, websites compete for top spots on search engine results pages. SEO or Search Engine Optimization, is the art and science of making your website attractive to search engines like Google. It’s the digital marketing strategy that ensures your website is the first one customers see when they’re browsing online.

1. Importance of SEO in the Digital Landscape of Sydney

SEO is as essential as a good flat white in the digital age to a Sydney morning. The lifeblood of online visibility is the Harbour Bridge connecting businesses to customers. Without it, your website is like a hidden gem in The Rocks – charming but hard to find.

2. Understanding Sydney’s Digital Market

Sydney’s digital market is a bustling metropolis of technological wonders, where the clatter of keyboards and the hum of servers fill the air. With a tech-savvy population and a penchant for innovation, Sydney has become a hub of digital activity. From the towering skyscrapers of the Central Business District to the trendy co-working spaces in Surry Hills, the city buzzes with digital entrepreneurs, creative agencies, and tech startups, each vying for their digital footprint.

Key Industries Dominating Sydney’s Online Space

The finance and tourism sectors are the Bondi Beach and Opera House of Sydney’s online space – they’re the big players, drawing in massive traffic. Meanwhile, tech startups and e-commerce are like the city’s trendy Inner West suburbs, rapidly growing and full of potential.

3. The Competitive Nature of SEO in Sydney

Sydney’s digital terrain is an eclectic fusion of industries, each carving out its niche in the competitive SEO landscape. The financial sector roars confidently with banks and investment firms, while the retail industry prowls with e-commerce giants and boutique stores. Hospitality establishments flaunt their presence, attracting hungry patrons with delectable offerings, and the tech industry leaps ahead with innovative startups and tech giants alike.

The Competitive Nature of SEO in Sydney

Amidst this vibrant mix, the battle for SEO supremacy unfolds, and an SEO consultant Sydney has a crucial role in guiding businesses through the backdrop. The city’s high population density is a double-edged sword. On the one hand, it presents a vast audience for businesses to reach, but on the other, it amplifies the competition.

Moreover, Sydney’s cosmopolitan nature attracts businesses from around the globe, further intensifying the competition. It’s like an international summit, where businesses from different corners converge, each armed with unique SEO strategies, aiming to claim their slice of Sydney’s digital pie.

4. Case Studies of Successful SEO Strategies in Sydney

Amidst the fierce competition, some businesses have triumphed by employing innovative and effective SEO strategies. Let’s delve into some captivating case studies from Sydney’s digital battlefield.

The Darling Harbour Hotel, a luxurious accommodation provider, embarked on a quest for SEO dominance. By conducting meticulous keyword research and crafting compelling content, they successfully climbed the search engine rankings, attracting digital visitors like a captivating siren luring sailors to their shores.

Another notable success story is Sydney’s own Le Chic Boutique, a fashion haven that embraced the power of local SEO. By optimizing their website with location-specific keywords and creating captivating fashion content tailored to the Sydney audience, they effortlessly strutted their way to the top of search engine results, like a supermodel gracefully owning the runway.

5. Challenges in Achieving High SEO Ranking in Sydney

Common SEO Hurdles in Sydney’s Market

Navigating Sydney’s SEO scene can be as tricky as finding a parking spot in Surry Hills on a Saturday night. Common hurdles include high competition, changing Google algorithms, and the need for continuous optimization.

Impact of High Competition on SEO Efforts

High competition in the landscape of SEO Sydney can make achieving a high ranking as challenging as swimming against the rip at Bondi Beach. It requires constant effort, vigilance, and a deep understanding of SEO strategies.

6. Strategies to Stand Out in Sydney’s SEO Scene

Emphasize Local SEO in Sydney

Local SEO in Sydney is as important as knowing your way around the city’s intricate network of one-way streets. It helps businesses attract local customers, making it a crucial strategy for standing out in the crowded Sydney market.

Quality Content in SEO Ranking

Quality Content in SEO Ranking

Quality content is the Vegemite on the toast of SEO – it might not be the main ingredient, but it’s what gives it flavor. It attracts and retains visitors, boosting your site’s ranking.

Significance of Backlinks and Social Signals

Backlinks and social signals are the Sydney ferries of the digital world – they transport users from one site to another, boosting your site’s visibility and credibility.

Importance of Mobile Optimization

Mobile optimization is key in a city where people are as likely to browse the web on their phones as they are to order a takeaway coffee. It ensures your site looks as good on a smartphone as the Sydney skyline at sunset.

7. Future Trends in Sydney’s SEO Landscape

Voice search is the new kid on the block in Sydney’s SEO scene, growing faster than the city’s skyline. As more Sydneysiders turn to voice assistants for their search needs, optimizing for voice search is becoming crucial.

Adapting to future SEO changes is like keeping up with Sydney’s ever-changing food trends – it requires flexibility, creativity, and a keen eye for what’s next.


Thriving in Sydney’s SEO scene is like mastering the city’s public transport system – it might seem daunting at first, but with the right strategies and a bit of local knowledge, you’ll navigate it like a pro in no time. So, buckle up and enjoy the ride – the view from the top of the SEO rankings is worth it.

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