A Robots.Txt file is a text file that webmasters use to tell web robots (such as search engines) which pages of a website to crawl or not. Mainly, it is used to prevent the requests that a site receives from overloading it. This file uses the Robot Exclusion Standard.
The Robots.txt files regulate the entry of bots to various areas of a site. While it can be terrible if bots are accidentally not allowed to crawl an entire site, there are certain cases where a robots.txt file can help:
You might not require a robots.txt file at all when there are no sectors on a site that you want to control user access to.
Search engines have two main functions:
1. Search and crawl the web to find content;
2. Create indexes for that content to be able to serve it to information seekers.
Search engines follow links to travel from one site to another to crawl sites or web pages, eventually traveling billions of links, pages, and websites. This tracking behavior is sometimes known as "spiders."
After entering a web page and before modifying it, the bot will look for a robots.txt file. If it finds it, the bot reads it before proceeding down the page. This robots.txt file has information on how the search engine should crawl, the information contained there and will specify further bot operations on this specific site. If there is no command that does not allow a user agent to act on the robots.txt file or there is no robots.txt file on the website, the bot will continue to crawl more information on the website.
The Robots.txt syntax is considered the "language" of these files. A new robots.txt file can be made using any plain text editor. There are five common terms generally found in a robots.txt file: