Kamis, 24 Juli 2008

Search Engines and Page Rank

post by : http://wongnganggur.blogspot.com

Google search has one of the largest databases of Web pages, including many other types of web documents (blog posts, wiki pages, group discussion threads and document formats (e.g., PDFs, Word or Excel documents, PowerPoints). Despite the presence of all these formats, Google's popularity ranking often makes pages worth looking at rise near the top of search results. Our web searching workshop reflects our recognition that Google currently is the winning web search engine and so people need to learn to use it really well.

Google alone not always sufficient, however. Less than half the searchable Web is fully searchable in Google. Overlap studies show that more than 80% of the pages in a major search engine's database exist only in that database. Getting a "second opinion" is therefore often worth your time. For this purpose, we recommend Live Search, Ask.com,search engine guide, search engine watch, search engine colossus or Yahoo! Search. We no longer recommend using any meta-search engines.

PageRank relies on the uniquely democratic nature of the web by using its vast link structure as an indicator of an individual page's value. In essence, Google interprets a link from page A to page B as a vote, by page A, for page B. But, Google, yahoo, Technorati, indo top and any looks at more than the sheer volume of votes, or links a page receives; it also analyzes the page that casts the vote. Votes cast by pages that are themselves "important" weigh more heavily and help to make other pages "important".

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