Tthe description element is another part of HTML that has uses with search engines. Well designed websites use the description element not only for keywords and a simple description of the page, but also it can control how the page shows up in search engines (once again, a better explanation of this can be found in the Googlebot Meta Tags post )
For WordPress users, there are various plugins that can be used. Another way to control the description of a post is to alter the header.php of the theme to use the_excerpt for the description.
The following is the code that would produce this:
<meta name="description" content="<?php the_excerpt() ?>" />
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