Nobody likes to work.
But most people prefer working to rummaging through dumpsters for the really fresh waste, so most of us will need a cover letter at some point in our lives. Each cover letter must be produced for a specific employer. If you're thinking that you don't know anything about a potential employer or what it has done, then bust out the ginseng. You've got some research to do. This background information about the industry will help you to write all cover letters for jobs in the industry.