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Web Search Engine:
A search engine like Alta vista or Hot Bot offers a much more complete database of what is on the web because the database of what is on the web because the database is complied automatically. A search engine uses software agents, sometimes called spiders or software robots, to explore the web retrieve information and send it to the data base. To find information with search engine, you type a query using keyword just you might locate construct complex queries using Boolean logic. A search engine can easily produce a list of hundreds of hits pages that contain requested keywords or match a query. Most search engines attempt to list pages in order from best to worst, but their rankings are not nearly as reliable as those done by the human researchers. Who create directories like yahoo. Still search engines are invaluable research tools especially when, you need to find something that has not been cataloged in your favorite directory.
