A square or rectangular based pyramid is a 3D shape with 5 corners or points. It also has 4 triangular flat flaces, one square/retangular face and 8 straight edges.
A 3d shape with 5 faces can be a square pyramid
pyramid
It cannot be a simply connected 3d shape because it does not satisfy the Euler characteristic.
There is no such 3-d shape if it also has flat faces.
cube
cube
A pyramid
Pentehedron
A square-based pyramid.
It depends on the 3d shape.
It is not a 3D shape.
A camera is a 3D shape. A photograph is a 2D projection of a 3D shape onto a 2D shape.