META Keywords and META Description

META Description
Syntax: < META name="Description" content="Web page description">

This is a Meta tag that provides a brief description of a Web page. It is important the description clearly describes the purpose of the page. The importance of the Description tag as an element of the ranking algorithm has decreased significantly over years, but there are still search engines that support this tag. They log descriptions of the indexed pages and often display them with the Title in their results.

The length of a displayed description varies per search engine. Therefore you should place the most important keywords at the beginning of the first sentence -- this will guarantee that both users and search engines will see the most important information about your site.

META Keywords
Syntax: < META name="Keywords" content="keyword1, keyword2, keyword3">

This is Meta tag that lists the words or phrases about the contents of the Web page. This tag provides some additional text for crawler-based search engines. However because of frequent attempts to abuse their system, most search engines ignore this tag. Please note that none of the major crawler-based search engines except Inktomi provide support for the Keywords Meta tag.

Similar to the description tag, there is a limit in the number of captured characters in Keywords meta tag. Ensure you've chosen keywords that are relevant to the content of your site. Avoid repetitions as search engines can penalize your rankings. Move the most important keywords to the beginning to increase their prominence.