Broth is a flavorful liquid produced by cooking beef or chicken with water. The meat and bones are strained away and the resulting liquid is used for flavoring soups, stews and sauces.
Homemade broth is easy to make, freezes well and provides the best flavor without the addition of excess amounts of salt. Canned and boxed versions are available if you don't choose to make your own. A common brand is Swanson and can be found in any local grocery store. Another reliable brand is produced by Manischewitz.