Sometimes you dont want certain pages f your website to be indexed on search engines, so you use robots to allow and disallow pages/directories to crawl and index.
Robot.txt file helps to reindex your modified page or index your new page at first while submitting it in GWT. Also, it gives the news to the search engine robots. So it's easy to crawl the new or modified site to index them.
If you only start your web project, robot.txt disallow spy bots to check your not ready website and don't get them ranking your website without content. More often that's mean you will be far from top 100.
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