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 specialist in web pages, images, information and other types of files. Some search engines also mine data available in databases or open directories
When people mention the term "search engine", it is often used generically to describe both crawler-based search engines and human-powered directories. In fact, these two types of search engines gather their listings in radically different ways and therefore are inherently different.
Crawler-based search engines, such as Google, AllTheWeb and AltaVista, create their listings automatically by using a piece of software to “crawl” or “spider” the web and then index what it finds to build the search base.
Human-powered directories, such as the Yahoo directory, Open Directory and LookSmart, depend on human editors to create their listings.
we’ve listed the top 10 general-purpose search engines used by people all over the world.
免費玩Top Best Search Engine SW APP玩免費
免費玩Top Best Search Engine SW App
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