nofollow is a way for a web site to tell search engines not to give any credit to a link on a web site.
The nofollow option was mainly developed to help reduce
Spam messages with links being posted to web sites, 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 web site, 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 only :-
robots.txt:-
User-agent: Googlebot
Disallow: /directory_not_to_follow/
User-Agent: Googlebot
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>
noindex, the basics is a way of asking search engine not to index a web page, 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" />
DO NOT PAY FOR PAGERANK or to try to INCREASE PAGERANK. This is AGAINST Google Rules. DO NOT PAY for links which promise high page ranking.
Most if not all paid link should use no-follow tag to stop page rank increase. See Google PageRank®
Google and most other search engines use links to determine reputation. A
site's ranking in Google search results is partly based on analysis of those
sites that link to it. Link-based analysis is an extremely useful way of
measuring a site's value, and has greatly improved the quality of web search.
Both the quantity and, more importantly, the quality of links count towards
this rating.
However, some SEOs and webmasters engage in the practice of buying and
selling links that pass PageRank, disregarding the quality of the links, the
sources, and the long-term impact it will have on their sites. Buying or
selling links that pass PageRank is in violation of Google's webmaster
guidelines and can negatively impact a site's ranking in search results.
Not all paid links violate our guidelines. Buying and selling links is a
normal part of the economy of the web when done for advertising purposes, and
not for manipulation of search results. Links purchased for advertising should
be designated as such. This can be done in several ways, such as:
Adding a rel="nofollow" attribute to the <a> tag
Redirecting the links to an intermediate page that is blocked from
search engines with a robots.txt file
Google works hard to ensure that it fully discounts links intended to
manipulate search engine results, such excessive link exchanges and purchased
links that pass PageRank.
Google’s search quality group. Here’s a policy discussion about NOINDEX and how Google should treat the NOINDEX meta tag. First, you’ll want to read this post about how
NoDoFollow Is a FireFox Plugin Just a simple extension to highlight links in a page according to nofollow / dofollow status. More Browsers and Browser Tools
Advice: nofollow or/and noindex are not ways of protecting the security of a web site or ever keeping pages private. Some search engines or other web sites may just ignore these options. They are a request only. Adding NoFollow or/and NoIndex could reduce the number of recognized external links on a web site and this may have a negative impact on the Google PageRank® of your own web site.
May be useful in helping to reducing Spam on for Forums and on Blog sites
Link/s on a NoFollow web sites are more likely to be respected by real users because they are believed to be listed due to their good content and not listed as just a way to try to improve ranking such as with GoogleRank®
Remember that a link/s on NoFollow web sites are may be used be real people who may post yours details and link/s with out the NoFollow elsewhere and this could improve your ranking with GoogleRank®
Not all search engines may use the NoFollow/NoIndex request, it is only a request.
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