Is it necessary to use Robots.txt?

The robots.txt protocol is a useful tool to prevent certain bots from spidering certain pages/sections of sites while allowing others through. It's also a lot easier to modify a robots.txt file than it is to update dozens, hundreds or even thousands of Web pages to make a single change. Also, unlike the META tag, the robots.txt file can block SPECIFIC search engine spiders from crawling and indexing your site.
And has already been mentioned, not having a robots.txt file can clutter your server logs with needless 404 error returns.
 
The robots.txt protocol is a useful tool to prevent certain bots from spidering certain pages/sections of sites while allowing others through. It's also a lot easier to modify a robots.txt file than it is to update dozens, hundreds or even thousands of Web pages to make a single change. Also, unlike the META tag, the robots.txt file can block SPECIFIC search engine spiders from crawling and indexing your site.
And has already been mentioned, not having a robots.txt file can clutter your server logs with needless 404 error returns.

great Information. Thanks for sharing !!
 
The robots.txt protocol is a useful tool to prevent certain bots from spidering certain pages/sections of sites while allowing others through. It's also a lot easier to modify a robots.txt file than it is to update dozens, hundreds or even thousands of Web pages to make a single change. Also, unlike the META tag, the robots.txt file can block SPECIFIC search engine spiders from crawling and indexing your site.

And has already been mentioned, not having a robots.txt file can clutter your server logs with needless 404 error returns.
 
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