
The robots.txt File
                  
                  Search engines make use of a file called robots.txt to determine 
                  which web pages (and other files) are excluded from indexing 
                  when they visit your site. A sample robots.txt file has been 
                  included in your public_html directory.
                  Not all search robots honour this file. Never keep any sensitive 
                  information in your public_html directory as it could be viewed 
                  by anyone or indexed by search engine robots.
Some services are now indexing graphics on the web. If you don't want your images to be accessed in this manner, include them in your robots.txt file.
In case your robots.txt file is damaged or missing, here is a sample of the file. Simply cut and paste in-between the dashed lines.
it is direct to robot where they go, access area or non access area,
if you want to disallow to robot to read a cgi-bin directory write below
User-agent: 
                  * 
                  Disallow: /cgi-bin/ 
you 
                  want to stop google robot to read you site's particular area 
                  use below
                  
                   User-agent: googlebot
                  Disallow: /cgi-bin/ 
You 
                  want to stop search engine to stop read your site 
                  
                  User-agent: *
                  Disallow: / 
                  
                  You can also stop search engine to read page add below in meta 
                  tag
                  
                  <META NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW"> 
                   
And 
                  if you want to stop read a particular file
                  
                  Disallow: email.htm