What is a Skin?
In the context of construction and woodworking, a skin refers to a thin layer or covering that is applied to the surface of a structure or object to provide protection, aesthetic enhancement, or both. It is commonly used in the construction of cabinets, doors, furniture, and other wooden or composite structures.
A skin is typically made of a material that is compatible with the intended use and desired appearance. For example, in cabinetry, a skin is often made of plywood, MDF (medium density fiberboard), melamine, or veneer. These materials are chosen for their durability, strength, and ability to be finished in various ways such as painting, staining, or laminating. 
The purpose of applying a skin is primarily to create a finished and uniform look, concealing the underlying structure and providing a clean appearance. Skins can be used to cover exposed sides or surfaces of cabinets or furniture, giving them a consistent finish. They can also be used to protect the underlying material from moisture, wear, or damage.
