Robots.txt
Robots.txt is a file that tells compatible crawlers which paths they may or may not crawl
What it means, how it is used and where it comes up, with its related concepts.
What it is and how it works
It is published at the root of the site and does not work as a mechanism for protecting information. Blocking a URL in this file does not guarantee it will be removed from the index. To apply a noindex directive, the crawler normally needs to be able to access the content that contains it.
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