While search engines usually accept almost any site or page that is submitted to them, without looking at its quality , Directories normally only accept sites that are informative & qualitative.

The sites submitted to Directories are reviewed by Human Editrors hence sites of low quality are rejected.

The most important Directories are :

• Yahoo,
• Looksmart through zeal.com
• DMOZ, also known as Open Directory.
• Goguides
• Joeant
• Google Directory
• About.com