A pillow is designed to provide support and comfort to the body and head. There are three main types of pillows; bed pillows, orthopedic pillowsand decorative pillows, with some overlapping of use between these. The appropriate size of a bed pillow depends on the size of the bed. Larger pillows than standard are available for queen- and king-sized beds.
The choice of bed pillow depends to some extent upon sleeping positions: one manufacturer recommends a thinner and softer pillow for sleeping face down, medium support for sleeping on one's back, and a thicker and firmer pillow for sleeping on the side.