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Friday, March 31, 2017

Different kind of Search Engine ||বিভিন্ন ধরনের সার্চ ইঞ্জিন



Crawler-Based Search Engines

Crawler-based search engines use automated software programs to survey and categorise web pages. The programs used by the search engines to access your web pages are called ‘spiders’, ‘crawlers’, ‘robots’ or ‘bots’. Crawler-based search engines are constantly searching the Internet for new web pages and updating their database of information with these new or altered pages.
Examples of crawler-based search engines are:

Directories

A ‘directory’ uses human editors who decide what category the site belongs to; they place websites within specific categories in the ‘directories’ database. The human editors comprehensively check the website and rank it, based on the information they find, using a pre-defined set of rules. Since late 2002 Yahoo has provided search results using crawler-based technology as well as its own directory.
There are two major directories at the time of writing:

Hybrid Search Engines

Hybrid search engines use a combination of both crawler-based results and directory results. More and more search engines these days are moving to a hybrid-based model. Examples of hybrid search engines are:

Meta Search Engines

Meta search engines take the results from all the other search engines results, and combine them into one large listing. Examples of Meta search engines include:

Internet Connection Device Search Engines

This engines can search all internet connected devices and you can get device information .

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