What is the seat cushion?

A seat cushion is a soft padded material placed on top of a chair or other seating surface to provide comfort and support. It is typically made from foam, feathers, or other soft materials and comes in a variety of shapes and sizes. Seat cushions can be used for both indoor and outdoor seating, and can help to improve comfort and posture while sitting. They are often used to add extra comfort to hard surfaces, such as wooden chairs or metal benches, and can also help to reduce pressure on the tailbone and lower back. Some seat cushions also feature additional features, such as heating or cooling elements, massage functions, or adjustable height settings.