NETS for Building 3D-shapes
    If we join together six identical squares, edge to edge, we get a cube or the outside surface of the cube.

 A net for a three dimensional shape is nothing but a sort of skeleton-outline in 2-dimension which, when folded, results in three dimensional shape. 

In figure (i) the shape of the pattern of six squares. When this shape is folded along the edges, a cube is formed as shown.