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.
There are primarily three types of search engines: traditional search engines, vertical search engines, and meta-search engines. Traditional search engines like Google and Bing index the entire web and return results based on algorithms. Vertical search engines focus on specific niches or industries, such as medical or academic searches. Meta-search engines aggregate results from multiple search engines to provide a broader range of information.
Because aviation is central to so many parts of air defence, travel and industry
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 many types of search engines like Google, Yahoo, Bing, Alta vista etc.
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.
Over 70,000 worldwide. Many are specialized.
That is not exactly true. A "meta search engine" pays importance only to the meta tags and meta discriptions of the HTML code. A search engine that searches many search engines is a mashed search engine, because it mashes the api of dfferent search engines. Examples for meta search engines are: http://metaspider.com/ or http://megaspider.com/ (very old) Examples for mashed search engines are: http://dogpile.com/ or http://avasearch.com/