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About Search Engine and Types of Search Engine |
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A search engine or search service is a program designed to help find information stored on a computer system such as theWorld Wide Web, inside a corporate or proprietary network or a personal computer. The search engine allows one to ask for content meeting specific criteria (typically those containing a given word or phase) and retrieves a list of references that match those criteria. Search engines use regularly updated indexes to operate quickly and efficiently. Without further qualification, search engine usually refers to a Web search engine, which searches for information on the public Web. |
According to some analysis total number of search engies are 3,105.
Types of Search Engine
There are three main categories of search engine.
- Indexes
- Directories
- Pay of view
- Meta
Indexes
Indexing search engines use software to scour the web for links and content, then “index” all of the found words and their associated web locations and assign them rankings according to relevancy. They are very automated and simply input data into their vast databases to use the relevancy rules they create to determine how to list results from search queries.
Some of the index search engines are
Directories
A directory does not automatically add links to a database. Instead, it relies on human editors to look at sites, to determine where they belong in the directory, and to place links to the sites in their database.
Some of the directory search engines are
Pay- Per-Click
Some search engines require companies to pay for each visitor that they send to their site, allowing them to purchase the top placement for a specific keyword. These search engines can often generate excellent search results because they filter out inappropriate sites by requiring payment for placement.
Some of the pay per click search engines are
Meta Search Engines
In a meta-search engine, you submit keywords in its search box, and it transmits your search simultaneously to several individual search engines and their databases of web pages. Within a few seconds, you get back results from all the search engines queried. Meta-search engines do not own a database of Web pages; they send your search terms to the databases maintained by search engine companies.
Some of the Meta search engines are
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