A search engine is like an online phonebook that allows users to find web pages, images, and other files by entering search terms. The largest search engine is Google, but others like Bing and Yahoo are also available. Search engines allow users to modify searches to find exactly what they're looking for. Filters like Safe Search can block certain content and images, making search engines safer if a computer is shared with children. To start a search, users open their internet browser, go to a search engine website like Google, enter search terms, and click search to view results.