Pet cats eat commercial cat food that meets feline nutritional needs. This commercial food can be dry kibble that comes in a bag or wet food from a can or pouch. The diet can be supplemented with treats, which should compose only a small part of a cat's diet.
All nutritionally complete cat diets have taurine in common, which is an essential amino acid that is necessary for healthy eye function in cats. Taurine is found naturally in meat-based proteins and is often supplemented in commercial cat foods to ensure that cats consume all the taurine they need to stay healthy.