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Search Engine


A search engine is a system designed to find information on the Internet. The user enters key words into a search engine which then trawls through an index list in order to find a best match. The results are then displayed in a list with the most relevant at the top, followed by the next relevant and so on.


The most popular search engines are Google, Yahoo, Ask.com and Wikia Search. These deal with general information and are considered to be reliable and useful. They work by firstly, using a web crawler an automated browser which follows all the links in a wide range of web pages. It then analyses each page with the aim of extricating certain words which it then places in an index. This index is then accessed by the search engine which then provides a list of best matching web pages. These pages are ranked (Google) according to relevance.


Search engines are considered especially useful by web designers who aim to ensure that their sites are highly ranked and visited repeatedly by using search engine optimisation (SEO). This is the process whereby the designer will insert various keywords and/or Meta tags which will be picked up by the search engine's web crawler in order to ensure a higher ranking.

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