Search Engine Marketing (SEM) is a strategy to promote a website in search engines like Google, Bing, Yahoo etc. to gain more traffic from organic search results, as well as paid search results. In paid search engine marketing, advertisers bid on keywords related to their business services or products that users might search on search engines like Google, Bing, Yahoo, etc. These ads then appear in different formats on search engines like text ads, shopping ads, display ads etc.