there is moist canned food and also dry cat food which comes in different sized cans or bags and formulas. there are kitten formulas, cat formulas, health formulas, formulas for reducing a cat's weight, and many others. it seems obvious that the food should be mostly meat, as that is most of a cat's natural diet. but remember, when they catch mice, they also eat the bones. so there is need for formulas to have more than just meat.