1.6 : Types of Search Engines and list of top search engines

Several types of Search Engines :

There are several types of search engines which are listed below :-

1. Crawlers
2. Directories
3. Hybrids
4. Meta

• Crawlers :-

Crawler types of search engines will uses “spider” or a “crawler” to search the Internet web pages.  The spider digs through individual web pages, pulls out keywords in the content and then adds the pages to the search engine’s database.

Example :-  Google and Yahoo are examples for the crawler based search engines.

 

• Directories :-

Directories are the “human powered search engines”.  websites are submitted to the directory and will be approved after reviewing the site or webpage completely.

Example :-  “Open Directory Project” and “the Internet Public Library” are examples for the directories based search engines.

 

• Hybrids :-

Hybrids are a mix of directories and crawlers. Sometimes, you have a choice when you search whether to search the directory or a Web.  sometimes, you may receive both human powered results and crawler results for the same search.  In this case, the human results are usually listed first.

 

• Meta :-

Meta search engines are one that search several other search engines at a time and combines all the results into a single list. When you get more results with meta search engines, the relevancy and quality of the results may sometimes suffer.

Example :- Dogpile and Clusty are examples of meta search engines

 

Top list of Search engines used

Here the list of top most search engines are listed below :-

1. Google : Crawler-based search engine
2. Bing : Crawler-based search engine
3. Yahoo : It is Human-Powered Directory, also provides crawler-based search results which is powered by Google
4. Baidu : Crawler-based search engine Chinese search engine
5. AOL : Provides crawler-based search results powered by Google
6. ASK : Provides crawler-based search results powered by Teoma