A Cylinder
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A cylinder has to parallel bases (circles) therefore a cylinder is circular prism
A cylinder has a circular cross section, a rectangular prism has a rectangular cross section.
The bases of cylinders are circular whereas the bases of prisms are polygons.
It is easier to say and shorter to write. Both terms are correct though.
The faces are always rectangles on prisms, so if it's a triangular prism the bases are triangles; if it's a rectangular prism, the bases are rectangles; if it's a hexagonal prism, the bases are hexagons. Any polygon can form the base of a prism. Some people also consider cylinders to be circular prisms. In which case any closed plane shape can form the base of a prism.