A Search Engine Explained
With the widespread growth of the World Wide Web a specially designed tool to search through the information available was developed called the search engine. Using both algorithms and human editing the search engine will present results organized in a list consisting of web pages, information, links, and images. These results are viewed by the user after inputting a keyword or keyword phrase in to the search engines search field.
The search engines stores millions of pages of data available on the web and then uses different processes to deliver the most relevant data required by the users. Web crawling, indexing and searching are different processes that are used for the purpose and the order remains the same. The web crawler which is also known as the web spider works by scanning all the visible links. The web crawler, working as an automated web browser, examines all the pages and takes a decision on the indexing of the pages.
Words found inside the pages are extracted from the description and allocated appropriate meta tags. Meta tags are also taken from contents the webpage itself to establish its relevance. Data from the sites is collected, indexed and stored to be retrieved when it's needed.
The major search engines, such as Google amass all, or a miniature portion of the source page, or "cache", in addition to information the web page offers. The search engine, AltaVista stores every word from every page. Storing the cache helps the search engine filter more easily because web pages are updated constantly. Google's technique of indexing relieves the "linkrot" and allows users to be sure that the content they find in their search results will be up to date and utilizable. The cache can be helpful when obsolete information is removed. The cache allows users to find and recover information from archived sources.
Search engines will examine keywords entered by the user and obtain a list of organized search results. Summaries may also accompany web links on the results page.
Many filters and specialized web crawlers create a proprietary method for analyzing web pages for results. While a keyword can be found a very large amount of websites not all sites are relevant to the users purpose and companies pride themselves on result relevancy.
Page rank is latest addition in the techniques used by search engines to sort out various web pages and their contents. Page rank decides the relevance of a particular page by studying the correlation between its meta tags, descriptions, keywords used and the content of that webpage. The search engines rank those sites high that have association with high ranked web pages. The page rank is essential for any web page or site as it determines its probability of featuring at the top of any particular search.
About the Author:
Justin Harrison is an internationally recognised Internet Marketing expert who provides world class SEO Services to website owners. For more information visit: http://www.seorankings.co.za
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