Joint compound is a thick paste used in construction and home improvement to finish drywall seams and repair surfaces. It helps create a smooth, even surface for painting or wallpapering. Joint compound is typically made from a mixture of gypsum dust, water, and additives that enhance its performance. There are different types of joint compound, including pre-mixed, setting, and taping compounds. Pre-mixed joint compound is ready to use, while setting compound hardens quickly and is ideal for fast repairs. Taping compound is specifically designed for embedding drywall tape. Each type serves a unique purpose in the finishing process.