face, edge & vertex

On a 3-dimensional (3D) shape, a face is a side on the shape.

The side must form a 2D shape (eg square, triangle, etc)

eg the cube below has 6 faces or 6 sides.

On a 3-dimensional (3D) shape, an edge is where two faces meet.

eg the cube below has 12 edges.

On a 3-dimensional (3D) shape, a vertex is where two (or more) edges meet.

If a shape has more than one vertex, they are called vertices.

eg the cube below has 8 vertices.