A personal flotation device (PFD) is a safety equipment designed to keep a person afloat in water. PFDs come in various types, including life jackets, vests, and buoyancy aids, and are made from materials that provide buoyancy. They are essential for activities like boating, swimming, and fishing, helping to prevent drowning. Wearing a PFD is often required by law in many places, especially for children and during water sports. Proper fit and usage are crucial for effectiveness, as a poorly fitted PFD may not provide adequate support. Always check for safety certifications, such as those from the U.S. Coast Guard, when selecting a PFD.