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Types of search Engines
SEO Glossary


If you have knowledge, let others light their candles in it.

Margaret Fuller
 

Types of Search Engines

Crawler/Spider

A program which reads then indexes web pages. It bounces from links between pages and sites. This index is a large database of all the sites the crawler visited and read.

Examples of a Crawler/Spider:

Google
AltaVista
Excite

Directories

Reviewed by human editors. These editors list and categorize the site. You submit a site, and editors visit your site and editors write a review and/or a description.

Examples of a directory:

Yahoo
LookSmart
MSN

Pay Per Click

Pay per click search engines allow you to advertise keywords.The cost is based on your ranking and the amount of traffic generated.

Examples of a pay per click:

Overture
7Search.com
FindWhat.com

Hybrid Search Engines

Hybrid Search Engines search both Directories and Crawler based types of results to be presented. Today, many search engines combine a spider engine with a directory service.

The following is a list of the major Internet search engines and directories.

Website

Owned By

Listings Provider

PPC Provider

Google

Google

Google

Yahoo

Google (Yahoo Directory influences listings)

Overture

AOL

Google

Google

Microsoft

Inktomi, Looksmart

Oveture

Lycos

FAST

Lycos

LookSmart

n/a

Looksmart

AOL

Open Directory

n/a

Overture

FAST

Overture

Ask Jeeves

Teoma

Google

Lycos

Inktomi (also: Teoma, Fast, Google)

Overture

Ask Jeeves

Teoma

Google

Overture

AltaVista

Overture

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