nofollow is a way for a website to tell search engines not to give any credit to a link on a website.
The nofollow option was mainly developed to help reduce Spam messages with links being posted to websites, for example in comments on Forums and on Blog sites. If the links on the blog site use nofollow then the Spam links will not, (in theory), gain any benefit such as higher Google PageRank®.
If all links use the nofollow option this could have the issues that good links will also lose the credit in search engines they deserve.
nofollow may be implemented a number of ways for example to help prevent search engines accessing whole directories on a website, or individual pages or individual links on a page. (Doing it for individual links could raise maintenance issues because this may have to be done by hand)
nofollow, the basics :-
robots.txt:-
User-agent: Googlebot
Disallow: /directory_not_to_follow/
User-Agent: Googlebot
Disallow: /keepoutfile.htm/
individual web pages:-
<meta name=”robots” content=”nofollow” />
Individual links:-
<a href="http://www.what_ever_the_URL_is_to_follow.net">Search engines follow this link</a>
<a href="http://www.what_ever_the_URL_is_NOT_to_follow.net" rel="nofollow">Search engines no not follow this link</a> Note that robots can ignore your <META> tag. About the Robots <META> tagMatt Cutts quick comment on nofollow
Nofollow 101 - Understanding the Nofollow Tag How to use nofollow to boost internal & external linking Webmaster who saw a HUGE increase in traffic from Google after implementing some simple nofollow/robots restrictions. (Increase Google traffic by 1400%…) Wikipedia Nofollow A nofollow may help reduce Duplicate Content issues.noindex, the basics is a way of asking search engine not to index a webpage, it's like saying please don't list this page. You may wish to use this on pages that you would like to be more private.
<meta name="robots" content="noindex" />
Matt Cutts what should noindex do Wikipedia NoindexLearn How to Use NOINDEX & NOFOLLOW
Advice: nofollow or/and noindex are not ways of protecting the security of a website or ever keeping pages private. Some search engines or other websites may just ignore these options. They are a request only. Adding nofollow or/and noindex could reduce the number of recognised external links on a website and this may have a negative impact on the Google PageRank® of your own website. May be useful in helping to reducing Spam on for Forums and on Blog sites
.htaccess Files and .htaccess Help. How use to .htaccess
Apache open-source software and Apache Servers. Mod Rewrite
Also read robots.txt, Meta Tags and Duplicate Content
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