A life jacket is a personal flotation device designed to keep a person afloat in water. It is typically made from buoyant materials like foam or inflatable air chambers, which help prevent drowning. Life jackets come in various sizes and styles, suitable for different activities such as boating, swimming, or fishing. Wearing a life jacket is essential for safety, especially in unpredictable water conditions. They are often required by law on boats and are recommended for anyone engaging in water sports. Properly fitted life jackets can significantly increase the chances of survival in emergencies on the water.