Stucco is a building material made of aggregate, binder, and water that is applied wet and hardens into a solid surface. It is used to cover exteriors of buildings. The process of applying stucco involves first attaching lath and corner beads, then applying a scratch coat to embed the lath followed by a skim coat to smooth the surface and optional texture coat. Tools used include a hawk to hold the stucco and trowel to apply it in layers, scratching the first coat for texture before finishing with subsequent coats.