It is a polyhedron with two congruent faces: nothing more, nothing less. That can change if several additional conditions are required of the polyhedron.
A polyhedron that has two congruent faces is called a prism. It means that when it is cut at the cross-section, the shape is the same as its base.
A polyhedron that has 2 congruent faces is a PRISM. To be a prism, all the other sides (not including the 2 that are congruent) have to be 4-sided.
A Prismthe faces are called bases
There is not a term for a polyhedron with 2 congruent faces. There are multiple polyhedra with 2 congruent faces.
A right prism is a polyhedron that has 2 congruent faces which are sometimes called bases.
Parallelogram prism
A polyhedron with 12 congruent faces is a dodecahedron.
A cylinder would fit the given description
There are many, but the infinitely many types of prisms are probably the simplest.
There are infinitely many such polyhedra. A regular dodecahedron, for example.
It's a cube.