A pillow is a soft cushion that a person puts under their head when they are sleeping in a bed.
A pillow is made from two pieces of cloth that are sewn together and stuffed with a soft material, such as feathers, duck down, or synthetic batting (man made soft stuffing). Pillows are usually rectangular. Pillows are covered with a fabric sheet called a pillowcase. The pillowcase protects the pillow from getting dirty.