T-molding is a type of trim used in woodworking and furniture making to cover the edges of materials such as plywood, particleboard, or MDF. It is typically made of plastic or wood and is shaped like a T, with one side inserted into a groove in the edge of the material and the other side protruding to create a smooth, finished look. T-molding not only provides a decorative touch but also helps protect the edges of the material from damage and wear. It is commonly used in flooring, cabinetry, and other applications where a clean, professional finish is desired.