The file has instructions regarding how to crawl your website. Websites use this robot exclusion protocol to instruct the bots that are to be indexed on the website. You can limit these areas in the website that can be processed or not by these crawlers. Without this Robot’s txt file, the search engine crawlers do not index the pages on the website. It may be a small file but help you to rank your page. It contains “Allow”, “DisAllow” below the user-agent.
When you try to create this file it takes time and you are in confusion to add the Allow and DisAllow on the site. This tool helps you to generate the file automatically by feeding the right information about your website. Otherwise, you should be careful to know the guidelines to create Robots txt files like Crawl-delay, Allow, and DisAllow.