These are the search engines and directories, which provides search results for Yahoo.BingYahoo directoryGoogleWikipediaDmoz
results come from the Yahoo Directory
Search engines look through all the sites and try to figure out what they are about. then when you search, they list the most relevant one. Directories are more like the phone book. Sometimes they sort by relevance or popularity, but often times they are just a list... like yellowpages.
Search engine provides results of the web page based on the search query or term.
A hybrid search engine
An example of a metacrawler is Dogpile. It is a search engine that fetches results from various search engines, directories, and databases to provide users with a comprehensive list of search results.
This could be called a hit.
There are literally hundreds of search engines on the web. For a relatively good list, see the related link below.
A search directory is an online site that helps you find websites on a specific topic. There are very general directories like DMOZ to niche subject directories and local search directories as well.
Google is a search engine because it has a lot of websites. It is a very good search engine.
SERP-Search Engine Result Page.
search engines and directories