A net is the surface areas of a shape that have been unwrapped and laid flat. The net can then be folded again back into its original shape.

Alternatively, a net can be folded up into a 3D shape.

The net must form all the surfaces of the original object, and it must be one continuous shape itself.

there may be more than one net that can construct the same 3D object: for example, In the sequence below, the top could have been attached to the first, third or fourth side.