hello...
i think you are referring to the "keywords" and "description" meta tags - here's a link to an article for you that does a good job at explaining them:
http://www.submitcorner.com/Guide/Meta/keywords.shtmlthe keywords should be unique keywords that you would want to be returned for typical searches..so if you are a candy store, you'd want to have something like "buy chocolates candy online" for the keywords - it's somewhat typical to have shorter word search phrases that would match simple searches that people typically do...the description is just the little snippett that gets returned below the link in the search results, so it's best to keep it short and sweet (ooh - accidental pun on the previous example)...
does that help?
curtis