Which one of the following is not a search engine?

Concept: A web search engine and a web browser are two different kinds of software with two different jobs. A search engine is a remote service that crawls the World Wide Web, stores what it finds in an index, and returns a ranked list of links matching a typed query. A web browser is client software installed on the user's own device that sends HTTP requests, fetches pages, and renders HTML, CSS and JavaScript so the pages can be read and used.

Application to the names offered:

1. Google accepts a typed query and answers it from its own crawled index of web pages — that is precisely the work of a search engine.

2. Bing does the same from Microsoft's crawled index, and Yahoo also returns a ranked list of web links for a typed query (under a partnership announced in 2009, its results have been served from Bing’s index since 2010).

3. Chrome performs no crawling and maintains no index. It is the client program in which a result page is displayed: a query typed into its address bar is handed off to a search engine, and Chrome renders whatever that service sends back.

4. The name on this list that is a browser rather than a search engine is therefore Chrome.

Cross-check — what each name actually is:

The two are easy to confuse because a browser’s address bar doubles as a search box and Chrome ships with Google search as its default provider. That default is a setting inside the browser, not a change in what the browser is: the browser transports and displays, while the search engine crawls, indexes and ranks.