Types of search engines?
 

Hello friends I want to know that how many types of search engines are there on world wide web?:confused:

I have no idea,
I also want to know about them.

Normally they are not categorized unless you are using them with different domain extensions which are based on geographical are and your IP. i.e. google.com, google.co.in, google.co.uk

The term "search engine" is often used indiscriminately to describe crawler-based search engines, human-powered directories, and everything in between, they are not all the same. Each type of "search engine" gathers and ranks listings in radically different ways.

There are two types of SEO.
On page
Off page

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There are two types of SEO.
On page
Off page

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I think this is not the right kind of question you are asking because there is no classification or categorisation of search engines.