Agriculture can be divided into the two main categories of crop farming, in which plant photosynthesis is used to produce food and fiber, and livestock farming, in which domesticated animals are grown for meat, milk, and other animal products. Crop farming produces food consumed directly by humans, food for livestock, and fiber. Livestock farming involves the raising of animals for meat, dairy products, eggs, wool, and hides. Freshwater fish and even crayfish are raised on "fish farms." Beekeeping provides honey.