A trailer hitch is a device attached to the rear of a vehicle, designed to tow a trailer or other load. It typically consists of a receiver, which is a square tube that allows for the attachment of various towing accessories, and a ball mount, which connects to the trailer. Trailer hitches come in different classes, each rated for specific weight limits, ensuring safe towing. When using a trailer hitch, it's important to match the hitch class with the weight of the trailer being towed. Proper installation and maintenance are crucial for safety. Accessories like safety chains and hitch locks can enhance towing security and stability.