only one because if there is to much engines it might explode. Most researches use more than one to get different content. I like to use Norele.com and Norele.mobi.
There are about 12 major search engines in general, but if you mean how many search engines that are around the globe, refer to the related links below.
Yes there is search engines for assets. Just google it on google and you can find some many search engines for assets.
Search engines basically a program that receives your search request, compares it to the entries in the index, and returns results to you. There are many types of search engines defined in different groups according to their works. Here are the some examples of search engines :Google.comYahoo.combing.comaltavista.comAsk.com
There are two types of search engines 1. Hybrid search engines 2. Meta search engines
There are many types of search engines like Google, Yahoo, Bing, Alta vista etc.
Spider-Based Search Engines. Directory-Based Search Engines. Link-Based Search Engines.
It must me standle, which combines many search engines with different specific areas. you may try it standle.com
Search engines are site maps for the internet. Search engines organize information and make it accessible by search tools.There are many search engines today and each one has a different techniques.Google.com, Yahoo.com, Bing.com, Avasearch.com, Clasearch.com, Aol.com , Ask.com, Dogpile.com.Try each one of them to discover results
Many of them have paid adverstisements on them. == ==
There are too many different kinds of search engines to just give a number, so click on the link below for a full listing of all the different kinds of search engines.
Horizontal search engines are general-purpose search engines such as Google and Yahoo. Vertical search engines, meanwhile, are specialized by content such as Trulia, Mocavo and Yelp.
Over 70,000 worldwide. Many are specialized.