1.A paid inclusion is when a website pays a search engine so that their website could be displayed in the case that someone searches any key word that related to their website or products.
Here is an example of a paid inclusion. We all have seen these when we have looked for something on the web. Its interesting sometimes because you accidentally click on them thinking its a website regarding your search, but in fact its not.
2. With paid inclusion, companies pay to be considered but aren’t guaranteed to rank well.
3. In the early days of search, paid inclusion was a convenient way for search engines, such as Inktomi, Microsoft, Ask, Yahoo, Overture, AltaVista, and FAST, to obtain revenue
4. Microsoft and Ask moved away from paid inclusion—both search engines ended paid inclusion programs in 2004.
5. In 2012, Google re-incorporated paid inclusion within its search, though in a different form. Google Flights, Google Hotel Finder, and Google Shopping all have new forms of paid inclusion programs.
6. The advantage of a paid inclusion search engine is that spam is reduced while relevancy improves.
7. The FTC has advised search engines to clearly mark paid placement and paid inclusion in accordance with Section 5 of the FTC Act
8. Aaron Wall of the popular SEO site SEOBook.com criticize Google's use of paid inclusion as a way to push almost all organic rankings below the fold
9. A company who paid for inclusion within a search engine will still have its rankings determined by relevancy
10. The use of paid inclusion is controversial and paid inclusion's popularity has decreased over time among search engines.
Information got from Wikapedia
