Search Engine

{
  "id": "MLC-T-ENV-024945",
  "term": "Search Engine",
  "field": "Environment",
  "definition": "On the Internet, a search engine has three parts: A spider (also called a \"crawler\" or a \"bot\") that goes to every page or representative pages on every Web site that wants to be searchable and reads it, using hypertext links on each page to discover and read a site's other pages; A program that creates a huge index (sometimes called a \"catalog\") from the pages that have been read; A program that receives your search request, compares it to the entries in the index, and returns results to you. An alternative to using a search engine is to explore a structured directory of topics. Yahoo, which also lets you use its search engine, is the most widely-used directory on the Web. A number of Web portal sites offer both the search engine and directory approaches to finding information. There are about eight major Web sites with their own search engines (although some have an arrangement to use another site's search engine). Some sites, such as Yahoo, search not only using their search engine but also give you the results from simultaneous searches of other search indexes. Sites that let you search multiple indexes simultaneously include: Yahoo (http://www.yahoo.com); search.com (http://search.com); EasySearcher (http://www.easysearcher.com). Yahoo first searches its own hierarchically-structured subject directory and gives you those entries. Then, it provides a few entries from the Alta Vista search engine. It also launches a concurrent search for entries matching your search argument with six or seven other major search engines. You can link to each of them from Yahoo (at the bottom of the search result page) to see what the results were from each of these search engines. The major search engines on the Web are: Google (http://www.google.com); Alta Vista (http://www.altavista.digital.com); Excite http://www.excite.com); Hotbot (http://www.hotbot.com); Infoseek (http://www.infoseek.com); Lycos (http://www.lycos.com); WebCrawler (http://www.webcrawler.com).",
  "subject": "Information management and systems",
  "references": [
    "Web Guide Glossary"
  ],
  "url": "https://mlchart.com/terminology/environment/search-engine/"
}