Meta information helps to provide succinct references to your website for the purposes of indexing, most notably with search engines.
Debate rages as to the importance of meta data, especially with regard to page rank and other measures of page visibility. But, from a structural and "code hygiene" perspective, it makes good sense to utilize "keyword" and "description" meta tags.
The description tag should reference a short narrative (one or two sentences) that describes what the site or page is all about.
<meta name="description" content="The Georgia Institute of Technology is one of the nation's top research universities, distinguished by its commitment to improving the human condition through advanced science and technology.">
It is important that you have clearly defined the space (or spaces) that you want your site/page to dominate. The use of the keywords tag can help to itemize concepts with which you are hoping to have your content associated, but it must be done judiciously, so as not to diminish the perceived focus of the resource.
<meta name="keywords" content="Georgia Tech, technology, research, innovation, Yellow Jackets">
Note that the description and keywords meta tags should not contain any HTML formatting.