Answer: Advertising
Explanation: The process of putting out a notice or announcement in a public medium promoting a product, service, or event is known as advertising. Search engines like Google, Yahoo, Bing etc. make vast amounts of revenue through search-based advertisements. These are advertisements shown in response to a query made by the search engine user. This
makes search-based ads unique form of advertisement different from traditional ones. Advertising generates the vast majority of revenue in the search and social media portions of the Internet industry and would continue to grow as technology advances. This allows search providers to charge vendors for display ad placement or sponsored search results and each time a visitor clicks on an ad result.