Google uses text on your pages to determine what your page is about and then indexes it accordingly. Keyword stuffing used to be a favorite tactic of those in the seo business g=to get pages ranked high in the search engines.
These days that does not work and can actually hurt your site.
That being said a well written description whit the correct keywords help the search engines to help you. I try and keep my keyword density between 1.5% - 3%. Some keywords can be used more often without being spammy while others can only be used a couple of times. (long tail keywords of 4 words or more)
Descriptions also help your readers get a better feel for you and your company which is definitely a good thing.
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