SEO Code: is code written in to your web site that allows the search engines to read better what you mean your relative content to say. It will also keep the search engines from going off track and finding information on another site that you are linked to that might divert you from your key purpose

One example of this would be a The no follow tag (rel="nofollow") has been adopted by Google, Yahoo, MSN and the other major and minor search engines as a way to thwart spam. The no follow tag was originally created for bloggers who were being spammed in the comments area of their blogs with ads for pharmaceuticals, home loans and even adult ads.

These drive-by spammers contributed nothing to the blog but benefited from PageRank with links that pointed to their own websites. The nofollow tag simply says to a search engine to disregard this link as it is not to a 'trusted' source. The page at the other end of the no follow link will not benefit in PageRank. Most of the blog software and services now put in the no follow tag automatically for links in the comments area.

Another area where the no follow tag is being used is on publisher websites in on the sponsored link text. Google is especially keen on this noting that sponsored links may in fact be links to bad neighborhoods and should not gain from another site's PageRank. Yahoo disagrees with this philosophy so there is a nice debate going on now about the no follow tag in regard to sponsored links.

One area where one will definitely not want to use the no follow tag is when doing reciprocal link trades. In a reciprocal link trade, you're not only trading traffic with another website but PageRank as well. If you place a no follow tag on the text link of one of your reciprocal partners, this says a couple of things.

First, it says that you don't trust the website that you're linking to enough to endorse it (so why did you make the link trade in the first place?). It also says that you're willing to cheat your partners since they are giving your website PageRank in good faith that you'll do the same and you are employing means that will deprive them of this (so your link trade its not reciprocal).