When we use the Nofollow tag in web page design?

[allena]

Please tell me that if i m designing a web page then when and where should i use the "nofollow" tag.

 

[weblord]

nofollow is an HTML attribute value used to instruct some search engines that a hyperlink should not influence the link target's ranking in the search engine's index. It is intended to reduce the effectiveness of certain types of search engine spam, thereby improving the quality of search engine results and preventing spamdexing from occurring in the first place.

http://en.wikipedia.org/wiki/Nofollow

 

[allena]

where the no follow tag is used?

 

[Venture]

<a href="http://www.url.com" rel="nofollow"