They are two identical and parallel triangles.
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The three faces of the prism may be, but are not necessarily, rectangles. It depends on how the ends of the prism are cut/shaped.
They both have sides that are rectangular in shape. They both have a constant cross-sectional shape equal to the shape of the ends (triangle for a triangular prism; rectangle for a rectangular prism).
a triangular prism has to triangular bases while a rectangular prism has a rectangle as the bases.
A triangular prism
A triangular prism has two triangular faces, a rectangular prism does not have any.