<ul><li>A web search engine is designed to search for information on the World Wide Web and FTP servers. The search results are generally presented in a list of results and are often called hits . The information may consist of web pages , images, information and other types of files. Some search engines also mine data available in databases or open directories . Unlike web directories , which are maintained by human editors, search engines operate algorithmically or are a mixture of algorithmic and human input. </li></ul>
<ul><li>Spiders </li></ul><ul><li>Robots </li></ul>How do Search Engine Works
<ul><li>This is a list of Wikipedia articles about search engines , including web search engines , selection-based search engines, metasearch engines , desktop search tools, and web portals and vertical market websites that have a search facility for online databases . </li></ul>
<ul><li>Meta search engines look pretty much the same up front, but their approach to presenting results varies widely. Here's a list of Search Engine Watch's pick of the best and most popular metas for searching the web. </li></ul>LATEST SEARCH ENGINE
<ul><li>The first search engine created was Archie, created in 1990 by Alan Emtage, a student at Mc Gill University in Montreal. The original intent of the name was "archives," but it was shortened to Archie </li></ul>FIRST SEARCH ENGINE IN THE WORLD.
<ul><li>The best search engine was AltaVista before Google arrived. And just as AltaVista lost the #1 spot, disappeared and died, so will Google. Perhaps the successor will be one of these? </li></ul>LATEST SEARCH ENGINE
<ul><li>Google use spiders </li></ul><ul><li>Large index of keywords . </li></ul><ul><li>Google’s PAGE RANK . </li></ul><ul><li>1.frequency and location of keywords within the Web page. </li></ul><ul><li>2. Web page history. </li></ul><ul><li>3. number of other Web pages that link to the page in question </li></ul>
<ul><li>Yahoo! is one of the best known and most popular Internet portals. Originally a subject directory of sites, it now is a search engine, directory, and portal. To go to the Yahoo! portal and main starting point, use www.yahoo.com . </li></ul><ul><li> * A large, unique search engine database </li></ul><ul><li> * Includes cached copies of pages </li></ul><ul><li> * Includes links to the Yahoo! directory </li></ul><ul><li> * Supports full Boolean searching </li></ul><ul><li> * Wild Card Word in Phrase </li></ul>
<ul><li>Daily changing of background image. The images are mostly of noteworthy places in the world, though it sometimes displays animals, people, and sports. The background image also contains information about the element(s) shown in the image. </li></ul><ul><li>mages page shows the main picture from that day and four searches that refers to that image with three preview pictures per search term. </li></ul><ul><li>Left side navigation pane. Includes navigation and, on results pages, related searches and prior searches and Right side extended preview which shows a bigger view of the page and gives URLs to links inside of the page. </li></ul><ul><li>Video thumbnail Preview where, by hovering over a video thumbnail, the video automatically starts playing . </li></ul><ul><li>Image search with continuous scrolling images results page that has adjustable settings for size, layout, color, style and people. </li></ul><ul><li>Video search with adjustable setting for length, screen size, resolution and source . </li></ul>
<ul><li>AltaVista is a web search engine owned by Yahoo! . AltaVista was once one of the most popular search engines but its popularity declined with the rise of Google . In 2010, Yahoo! announced that it plans to discontinue the site . </li></ul><ul><li>AltaVista was created by researchers at Digital Equipment Corporation 's Western Research Laboratory who were trying to provide services to make finding files on the public network easier. Although there is some dispute about who was responsible for the original idea,. </li></ul><ul><li>in 1996, AltaVista became the exclusive provider of search results for Yahoo! . In 1998, Digital was sold to Compaq and in 1999, Compaq redesigned AltaVista as a web portal , hoping to compete with Yahoo!. Under CEO Rod Schrock, AltaVista abandoned its streamlined search page and focused on features like shopping and free email . </li></ul><ul><li>ltaVista provides a free translation service, branded Babel Fish , which automatically translates text between several languages. In May 2008, this service was re-branded as a part of Yahoo!. </li></ul>
<ul><li>There are 3 types of search engine </li></ul><ul><li>1.Crawler-based search engine </li></ul><ul><li>2.Human-power directories </li></ul><ul><li>3.Hybrid search engine </li></ul>TYPES OF SEARCH ENGINE
<ul><li>Crawler-based search engines, such as Google ( http://www.google.com ), create their listings automatically. They "crawl" or "spider" the web, then people search through what they have found. If web pages are changed, crawler-based search engines eventually find these changes, and that can affect how those pages are listed. Page titles, body copy and other elements all play a role. </li></ul>CRAWLER –BASED SEARCH ENGINE.
<ul><li>A human-powered directory, such as the Open Directory Project ( http://www.dmoz.org/about.html ) depends on humans for its listings. (Yahoo!, which used to be a directory, now gets its information from the use of crawlers.) A directory gets its information from submissions, which include a short description to the directory for the entire site, or from editors who write one for sites they review. </li></ul>HUMAN-POWERED DIRECTORIES
<ul><li>Today, it is extremely common for crawler-type and human-powered results to be combined when conducting a search. Usually, a hybrid search engine will favor one type of listings over another. For example, MSN Search ( http://www.imagine-msn.com/search/tour/moreprecise.aspx ) is more likely to present human-powered listings from LookSmart ( http://search.looksmart.com/ ). However, it also presents crawler-based results, especially for more obscure queries. </li></ul>HYBRID SEARCH ENGINE
<ul><li>There are three very compelling advantages of most search engines. </li></ul><ul><li>The indexes of search engines are usually vast, representing significant portions of the Internet, offering a wide variety and quantity of information resources. </li></ul><ul><li>The growing sophistication of search engine software enables us to precisely describe the information that we seek. </li></ul><ul><li>The growing sophistication of search engine software enables us to precisely describe the information that we seek. </li></ul>ADVANTAGES OF SEARCH ENGINE
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