| ppa | (PAY PER ACTION) This function is like Pay Per Click (PPC) with the exception that publishers are paid only when the click results in an actual conversion. |
| crawl page | Noun phrase. A document consisting of links to other pages, provided for the sole purpose of giving crawlers (robots) links to follow. Spammers used to submit these puppies to the search engines en masse. Maybe they still do. |
| link building | While building sounds like this activity involves creating links to your website yourself, link building actually describes the process of earning links to your site for the purpose of building your sites authority in search engines. |
| google supplemental index | A secondary database that Google uses to store pages it deems to be of less importance to its main search engine results. |
| unique content | Unique content is a term used in SEO to mean text based content that is original and has not been used before. If a webpage is said to be lacking in unique content, it means that it has little content that is unique to that particular page. |
