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Search enginesSearch engines are -- well -- "engines" or "robots" that crawl the Web looking for new webpages. These robots read the webpages and put the text (or parts of the text) into a large database or index that you may access. None of them cover the whole Net, but some of them are quite large. The major players in this field are Google, Yahoo! Search (which is not the same as the Yahoo! Directory), MSN Search and Ask. (A new version of Microsoft's search engine can be found at Windows Live.) Alta Vista and AlltheWeb are no longer search engines in their own right, as they are using results from the Yahoo! search engine. Yahoo! is also powering the Lycos portals, MSN Amazon.com's search engine A9, while Google feeds data to AOL and other portals. Search engines should be your first choice when you know exactly what you are looking for. They also cover a much larger part of the Web than the directories.==محركات البحث لها قواعد بينات خاصة وضخمة تعتمد عليها من اهم مكوناتها robot= spidrerالعناكب التي تزحف الويب وتزور المواقع الجديدة وتفهرس الصفحات لتضيفها لقاعدة البياناتوعندما نبحت نحن حقيقة لانبحت في ويب وانما في قاعدة بيانات كل محرك لدا فمحرك البحت يتكون من عناكبفهرسقاعدة بياناتوواجهة بحث