Robots.txt is text file used by Website owners to give instructions about their site to web robots. Basically it tells robots which parts of the site are open and which parts are closed. This is called The Robots Exclusion Protocol.

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Will duplicate international (i18n) content hinder SEO rankings?

Google clearly states that duplicate content within a single, or multiple, domains is not advised. This is understood, but I am not sure of any exceptions for sites with region-specific content that ...
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GoogleBot can't reach my site

For some reason, the other day, out of nowhere, Google Webmaster Tools started showing all these errors while crawling my site, saying that it couldn't reach my pages. I checked my robots.txt and ...
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Facebook and Crawl-delay in Robots.txt?

Do Facebook's webcrawling bots (for example facebookexternalhit/*) respect the Crawl-delay: directive in robots.txt files?
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Robots.txt practices with .htaccess redirections (inherits)

I have a question regarding how to write robots.txt files for many domains and subdomains with redirects in place. We have a hosting account that enacts primary and add-on domains. All of our domains ...
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Addon domains and SEO

I have a shared hosting account with a main domain and many add-on domains. I don't actually use the main domain, it just has a landing page. Can I tell bots not to index the main domain WITHOUT ...
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Is there a way to make Alexa's ia_archiver slow down its crawling of my website?

Alexa's ia_archiver bot is the main contributor to the Internet Archive's "Wayback Machine" web collection, and there are advantages to having my website included in that collection. There are other ...
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Need to know how to configure robots.txt for an age gate/age verification website

is it the normal allow all in the file? I need to make sure the crawlers can get through the gate. Thanks!