| follow | The default state of a link, follow links pass PageRank. |
| protocol | The http or https preceding your domain name. This governs how data is relayed between the server and browser. |
| quality index | Quality Index is like Yahoos version of Googles Adwords Quality Score. It can affect a users cost per click and ranking. |
| pay per click | Pay Per Click is a contextual advertisement structure where advertisers pay ad agencies whenever a user clicks on their promoted ad. One example of PPC is Google Adwords. |
| adsense | Contextual display advertising platform through Google. An automated process, opting into AdSense allows Google to place relevant ads on a website. Webmasters utilizing AdSense on their sites get a portion of ad click profits from Google. Contextual ads can be formatted as text links, graphics, animated graphics, and videos. |
