A life jacket is a safety device designed to keep a person afloat in water. It is typically made of buoyant materials, such as foam or inflatable air chambers, and is worn around the torso. Life jackets are essential for activities like boating, swimming, and fishing, as they help prevent drowning by providing buoyancy and support. Life jackets come in various types and sizes, suitable for different activities and age groups. They are often required by law on boats and are recommended for anyone engaging in water sports. Properly fitting and wearing a life jacket can significantly increase safety on the water.