Dubai Internet Marketing | Online Advertising UAE

What are Search Engines? What are their types? Which search engines and web directories are most popular?
[A part of KISS SEO Guide 2010 by Najam, a Dubai-based SEO Consultant]

Exactly what is a search engine? Basically, a search engine is a software program that searches for sites based on the words that you designate as search terms. Search engines look through their own databases of information in order to find what it is that you are looking for.

• Crawler-based Search Engines – such as Google, Yahoo & Bing, use software (also called robot, crawler, or spider) to automatically add new pages in their databases (index). It has three major elements:
  • Spider or crawler – visits a web page, reads it and then follow links to other sites.
  • The Index – everything the spider finds goes into the index like a giant book containing a copy of every page that the spider finds.
  • Search Engine software – a program that search through the millions of pages recorded in the index to find matches to a search and rank them of what it believes is most relevant.
• Human-powered Directories – such as Yahoo Directory, Open Directory Project (DMOZ) etc., use human to manually fill and manage their databases.
• Meta Search Engines – like MetaCrawler.com, DogPile.com etc. combines results from a number of search engines and display them at the same time.
• Pay-per-Performance & Paid Inclusion Engines – that accepts fee to keep your site listed, re-spidered, or top-ranked for keywords of your choice.

Major Search Engines & Web Directories

Search Engines

• Google
• Yahoo
• Bing [Live | MSN]

Online Web Directories

• Yahoo Directory
• The Open Project – DMOZ

PPC Search Engines

• Google AdWords
• Yahoo Search Marketing
• Microsoft Digital Advertising Solutions

Meta Search Engines

• MetaCrawler.com
• DogPile.com

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