What are nets?

Nets of 3D shapes

The net of a 3D shape is what it looks like if it is opened out flat. A net can be folded up to make a 3D shape.

There may be several possible nets for one 3D shape.

You can draw a net on paper, then fold it into the shape.

Nets of a cube and square based pyramid
The net of a cube and a square based pyramid.