A robots.txt file contains instructions for crawling a website. It is also known as the robots exclusion protocol, and it is used by websites to tell bots which parts of their website should be indexed. You can also specify which areas you don't want these crawlers to process; these areas may contain duplicate content or be under construction. Bots, such as malware detectors and email harvesters, do not adhere to this standard and will scan for flaws in your security, and there is a good chance that they will begin examining your site from areas you do not want to be indexed.
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