Which of the following is search engine.
All of the above are search engine.
Links allow the search engines' automated robots, called "crawlers" or "spiders," to reach the many billions of interconnected documents on the web. Once the engines find these pages, they decipher the code from them and store selected pieces in massive databases, to be recalled later when needed for a search query.
A web search engine is a software system that is designed to search for information on the World Wide Web. The search results are generally presented in a line of results often referred to as search engine results pages (SERPs). The information may be a mix of web pages, images, and other types of files.
A web search engine is a type of website that helps a computer user find information on the Internet. ... Quickly after a search is submitted the results appear on screen. This is called a search engine results page (SERP). The SERP is a list of webpages that contain matches to the keywords that were searched.