A cuboid is a 3D shape. Cuboids have six faces, which form a convex polyhedron. Simply speaking, cuboids are made from 6 rectangles, which are placed at right angles. A cuboid that uses square faces is a cube, if the faces are rectangles, other than cubes, it looks like a shoe box. Properties of a Cuboid are: It has 12 edges It has 8 corners or vertices It has 6 faces The basic difference between a rectangle an a cuboid is one is a 2D shape and other a 3D shape.