The Lost Foam method, also known as the lost foam mould, is a metal casting technique that uses a foam model of the part to be produced. The model is covered with a ceramic coating, which acts as a mould for the metal casting. Once the metal has been cast, the foam collapses and is replaced by the metal, creating the final part. This method ensures a high degree of precision in the shape and details of the part, as well as a smooth, even finish.