Add a few paragraphs that tell visitors what you're all about. Some people come to your site to buy a product or sign up for a service. Other people find your site via a search engine or a link from a friend, and these people might not know what you do.
Keep this description short, but thorough—so after someone reads it, they feel like they know what services or products you offer.
Also include a bit about your history. For example:
"Founded in 1901 by Caleb Deffell, Deffell's Pants has been the industry innovator in leg coverings for over 100 years. When your great-grandmother first dared to put on a pair of trousers, she turned to Deffells. That sentiment is still a big part of our design process today."