Use of robots.txt

[nitu]

What is the purpose for using robots.txt
What is it???
Why it is necessaruy to upload into site

[charter]

http://en.wikipedia.org/wiki/Robots.txt

[manish.chauhan]

You can find some more info here (http://seocrazy.blogspot.com/2008/04/robotstxt-stop.html)..:)

[fifty-one]

http://www.robotstxt.org/