A brad nailer is a type of power tool used for fastening thin pieces of wood or trim. It uses small, thin nails called brads, which are typically 18-gauge, to join materials without splitting them. This tool is commonly used in woodworking, cabinetry, and home improvement projects. Brad nailers can be powered by electricity, batteries, or compressed air. They are favored for their ability to quickly and efficiently drive nails into wood, making them ideal for tasks like attaching moldings or assembling furniture. Using a brad nailer can save time and provide a cleaner finish compared to traditional nailing methods.