Your description tag summarizes your page's content. Some search engines use this description to help categorize your page, and a few even display it in search results.
With this in mind, make sure your page's description is readable and interesting, and also features one or two keywords that appear on the web page.
Be sure your description doesn't exceed 256 characters. Include one or two of your keywords in the description and, if possible, place these near the beginning of your description.
Tip: Having trouble thinking of a description? Try using the first sentence or two from your page.