Final answer:
The surface or material that underlies a two-dimensional work of art is called the support.
Step-by-step explanation:
The surface or material that underlies a two-dimensional work of art is called the support. It refers to the physical surface on which the artwork is created, such as canvas, paper, wood, or any other material. The support provides the foundation for the artist to apply paint, ink, or other materials to create the artwork.