| penguin | Google Penguin is a series of algorithm updates designed to improve Google results. Penguin is considered to be an update that focuses on link related metrics. |
| html | Hypertext markup language is the language used to create web pages. |
| followed link | Allows link equity to be passed from one page to another. |
| qdf | Stands for query deserves freshness, where a search engine might decide to show newer webpages in search results (rather than older pages) if a particular search term is trending, perhaps because a news event has resulted in a surge in searches on that topic. |
| nonreciprocal link | When one site links to another but the second site does not link back to the first, the link is considered nonreciprocal. Less value is given to non-reciprocal links in terms of SEO value. |
