Placing ads in the search results pages (SERPs) of search engines such as Google, Bing or Yahoo is known as search engine advertising The ads are applied to predefined search queries called keywords. Therefore, the corresponding ad is displayed when a user searches for a specific term in the search engine. Because of this, it is often referred to as "Keyword advertising" spoken. "Search Ads" and "sponsored links“ are other terms. Explanations and definitions of the terms of SEA (search engine advertising) can be found in our SEA Lexicon.