Search engines are animal name?

What is a search engine?
The so-called search engines can provide a means to retrieve (search) system services to Internet users, the development of an intelligent system crawler, but it has a terrible name: spiders.
In short, the spider: spider, also called English robot (bot), meaning that the search engine on the Internet a program that kept crawling crawled pages. Vernacular understand, understand the Internet as a giant spider web, search engine spiders similar substance robots, spiders and the main task is to browse information in a giant spider web (Internet), then put this information into a search engine to crawl on the server, indexing library.