Today we're covering terms from N-P related to SEO - we're almost there!
natural search results These refer to search engine results which are the result of organic linking and not paid for or sponsored in any way.
nofollow This command is usually found in the HEAD section of a web page or within individual link code (usually looks something like rel="external nofollow" when represented as part of a anchor href statement). This tells search bots to not follow either any links on the page or that specific link. Use of the nofollow statement is a form of link condom.
noindex This command is found in either the HEAD section of a web page or within an individual link code. It instructs search bots not to index that page or the specific link. Again, this is a form of link condom.
non reciprocal link This is also known as a one-way link. if site X links to site Y, but site Y does not link back to site X, then the link is considered non reciprocal. Search engines tend to give more value to non-reciprocal links than to reciprocal ones because they are less likely to be the result of dodgy behaviour between the 2 sites.
organic link organic links are those that are published only because the content creator feels they will add value for their users.
pagerank (or google PR) is typically a value between 0 and 1 assigned by the Google. It is a measure of link popularity and authority amongst other mostly unknown factors. Newbies should not worry about this too much for now - it can be pretty random and most SEO specialists agree that real page authority and pagerank often have little correlation. Also Google is a bit painful when it comes to assigning pagerank.. it all appears somewhat random at times. In short, don't sweat it!
pay for inclusion This practice, also known as PFI in short, basically amounts to charging a fee to include a site in a directory or search engine. Probably good not to consider a Yahoo directory submission e.g. as a paid link - it just helps with faster consideration of your site by SEs
portal A consolidator website which offers a wide range of features to entice users to make the portal their “home page” on the web. IGoogle, Yahoo, and MSN are portals.
PPA (or Pay Per Action) is similar to PPC (Pay Per Click) except here the publishers only get paid when click throughs result in a conversion - be it a sale or lead or whatever.
PPC (Pay Per Click) this is an ad scheme where sponsors pay advertising agencies, e.g. Google Adwords, whenever a user clicks on their ad.
More soon :)