Search engines
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Search engines






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    Search engines Search engines Presentation Transcript

    • TOPICS TO BE COVERED What is a search engine? Purpose of search engines? How search engine opererates? How we can improve use of search engines? Advantages of search engines Disadvantages of search engines Conclusion
    • Search Engines Search engines are programes that allow the user to enter keywords that are used to search a database of web page Each search engine searches in a different way and searches different sites. That is why doing a search in one search engine will produce different results than doing the same
    • Purpose of search engines Helping people find what they are looking for Starts with an “information need” Convert to a query Get results
    • How search engine operates? Crawling the web, following links to find pages Indexing the pages to create an index from word every place it occurs Ranking the pages so the best one shows first Displaying the results that in a way that is easy for the user to understand
    • How we can improve use of searchengines You can get better results from an Internet search engine if you know how to use: 1. wildcards 2. Boolean operators
    • Wild Cards•A wild card is a special character which canbe appended to the root of a word so that youcan •" Wildcards possible to searchsearch for all allow youendings to that root. simultaneously for several words with the same stem.•Example: "educat*“, "smok*"
    • Boolean operators 1.AND 2.OR 3.NOTAND• Using the boolean operator “AND", it is possible tonarrow a search so that you get quite a limited set ofresults.OR•The boolean operator “OR" has the opposite effect ofexpanding a search.NOT•Another common operator is “NOT" which acts to limit asearch as well.
    • Advantages of searchs The indexes of search engines are usually vast, representing a significant proportions on the internet. The large number of variety of search engines enriches the internet, making it least appear to organiszed.  The growing sophistication of search engine software enables us to presicely describethe information that we seek.
    • Disadvantages of searchengines  They do not crawl on the web in the“realtime”.  If a site is not linked it may not be accesible. Not every page of a site is searchable. Special tools are needed for the Invisible or Deep web. Few search engines search the full text of web pages
    • ConclusionThe primary goal of search engine is to provide highquality search results over a rapidly growing worldwide web.Search tools like Google search engine employs anumber of techniques to improve search qualityincluding page rank, anchor text, and proximityinformation.As the technology advances at an unimaginablepace, it is not unwise expecting an efficient searchengine, which addresses all the needs.