Try to keep your description to 25 words or less, as many search engines will only place that many. Do the same for your keywords. I do suggest you place this on your pages in addition to the keywords you place on your page. Some search engines will only recognize your meta name description and meta name keywords. If you prefer a description, rather than only keywords, be sure to be creative with it.
Most people use a bland description of their page.
Try to develop a description that is stimulating and adds curiosity. Design it as you would a great display ad. Here are power words, and power phrases, in writing an effective description or ad copy that will pull people into your pages. Also consider adding some curiosity to your description. It will create more interest.