Most store-bought cat food comes in either dry form, also known as kibble, or wet canned form. Some manufacturers sell frozen raw diets and premix products to cater to owners who feed raw.
Major brand-name dry cat food manufacturers often use primarily grain-based ingredients like corn and rice with meat by-products or animal digest making up the meat ingredients. Some manufacturers offer 'premium', 'natural' or 'holistic' formulas that are by-product free and contains less or no grains. Grain-free dry diets still contain carbohydrates, from sources such as potato or tapioca as the starch in those ingredients is needed to allow the kibble to hold its shape. Cats have no metabolic need for carbohydrates as the feline system prefers to create glucose from protein.
Source : http://en.wikipedia.org/wiki/Cat_food
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