Miter saw is a power tool with a circular blade mounted on a frame and a rotating cutting table to make precise angled cuts in wood. It is used in woodworking and construction for tasks like installing molding, building frames, and making furniture, enabling accurate miter, cross, and bevel cuts. Key features include a swiveling base for angle adjustments, a tilting blade for bevel cuts (especially in compound miter saws), and a sliding mechanism for cutting wider boards.