It indicates as encrypted or confidential to hide the real text behind it.
Metasearch Engines
metasearch engines
Generally speaking, meta search engines perform searches using a conglomeration of other search engines. Metasearch engines enable users to enter search criteria once and access several search engines simultaneously. Metasearch engines operate on the premise that the Web is too large for any one search engine to index it all and that more comprehensive search results can be obtained by combining the results from several search engines. This also may save the user from having to use multiple search engines separately.
Wild card
A meta-search engine is a search tool that sends user requests to several other search engines and/or databases and aggregates the results into a single list or displays them according to their source. Metasearch engines enable users to enter search criteria once and access several search engines simultaneously.
wildcard
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/
There are two types of search engines 1. Hybrid search engines 2. Meta search engines
Spider-Based Search Engines. Directory-Based Search Engines. Link-Based 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.
Because an asterisk is designated as a wild card search character in database systems.
name five search engines