| skyscraper technique | A link building technique that involves improving already popular content to attract even more backlinks to it. |
| stop word | A frequently used word. For example: a, at, for, is, of, on, the. Search engines have, in the past, ignored these words to save time/resources when indexing. Search engines have evolved greatly since the early days, and stop words sometimes are meaningful, so this isn’t something to worry much about for SEO purposes. |
| semantic search | Refers to the technique that search engines use to generate relevant search results by analyzing the actual meaning of search terms in a particular context. |
| back link | A back link is a hyperlink into a page or site from any other page or site. A page with a lot of quality back links tends to rank higher on search engines. Back links from high-quality websites inform search engines that the website ?linking to is also trustworthy and of high quality. |
| co-citation | How frequently two websites (or webpages) are mentioned together by a third-party website, even if those first two items don’t link to (or reference) each other. This is a way search engines can establish subject similarity. |
