Face short Definition

(This is 10th grade math, please don't make it advanced)

In geometry, a face is a flat surface that represents one side of a three-dimensional shape. For example, a cube has six faces - each of its sides is a square face.

A face is a flat surface on a three-dimensional (3D) shape. It is the part of the shape that we can see when looking at it from the outside. Faces are usually represented by polygons, such as triangles, rectangles, or squares, and they are connected by edges. In simpler terms, a face is like a flat side of a 3D object.