Search engines are the key to finding specific information on the vast expanse of the World Wide Web. Without sophisticated search engines, it would be virtually impossible to locate anything on the Web without knowing a specific URL. But do you know how search engines work? And do you know what makes some search engines more effective than others?
When people use the term search engine in relation to the Web, they are usually referring to the actual search forms that searches through databases of HTML documents, initially gathered by a robot.
There are basically three types of search engines: Those that are powered by robots (called crawlers; ants or spiders) and those that are powered by human submissions; and those that are a hybrid of the two.
Sponsored10 New Reasons to Virtualize Your Infrastructure: The cost savings that comes with virtualization makes an easy selling point, but there are other reasons the technology makes sense.
Crawler-based search engines are those that use automated software agents (called crawlers) that visit a Web site, read the information on the actual site, read the site's meta tags and also follow the links that the site connects to performing indexing on all linked Web sites as well. The crawler returns all that information back to a central depository, where the data is indexed. The crawler will periodically return to the sites to check for any information that has changed. The frequency with which this happens is determined by the administrators of the search engine.
Human-powered search engines rely on humans to submit information that is subsequently indexed and catalogued. Only information that is submitted is put into the index.
5 seaech engines on the internet
1. Google
Google was founded by Larry Page and Sergey Brin in the year 1996.Google today has sky as its limit and all of us know that even an illiterate person know what google is.Google’s headquarters are located at 1600 Amphitheatre Parkway, Mountain View, California,USA.Today,Google is not only a search engine it is far more than that today google has now came up as a company and it serves the whole world.
2. Yahoo
Yahoo was founded by Jerry Yang and David Filo in the year 1994 but till 1995 Yahoo was called Jerry’s Guide to the World Wide Web but later in 1995 it was renamed as yahoo!.Yahoo today gives equal competition to Google and other big Internet boons.Yahoo’s headquarter are located at 701 First Ave. Sunnyvale, California, United States.
3. Baidu
Baidu is a Chinese company which serves China and Japan only but due to its high traffic it is ranked 6th on Alexa. Baidu offers search in Chinese only. Baidu’s headquarter are located at Beijing, China. Baidu was founded by Robin Li and Eric Xu.
4. MSN
Though Msn now has been converted into bing but it was a great search engine before that. MSN is a product of Microsoft and MSN is ranked 11 on Alexa.MSN serves the whole world. MSN is a portal website which makes MSN a good competitor of other search engines. MSN was launched by Microsoft on August 24, 1995.
5. Bing
Bing has a really nice full form which is “Bing is not Google”.Although this is not the official full form of Bing, Bing itself is a word. Bing is a product of Microsoft, Microsoft converted msn into bing. Bing’s rank on Alexa is 24 which is really nice.Bing has spent only a year in the search engine market but it has prospered a lot.Bing was launched on June 3, 2009.
ไม่มีความคิดเห็น:
แสดงความคิดเห็น