A pillow is a soft cushion used to support the head, neck, or other parts of the body while sleeping or resting. Typically filled with materials like foam, feathers, or synthetic fibers, pillows come in various shapes and sizes to accommodate different sleeping positions and preferences. They are often covered with fabric, which can be made from cotton, polyester, or other materials. Pillows play a crucial role in promoting comfort and proper alignment during sleep, which can help prevent neck and back pain. In addition to traditional bed pillows, there are specialized types, such as memory foam pillows and body pillows, designed for specific needs and preferences.