A triangular prism has 5 faces. To break it down, a triangular prism consists of two triangular bases and three rectangular lateral faces.
The two triangular faces are parallel to each other and form the ends of the prism, while the three rectangular faces connect the sides of the triangles. Each triangular face has three edges, making a total of 6 edges, and there are 5 vertices where the edges meet. Therefore, in total, a triangular prism has 5 faces: 2 triangular and 3 rectangular.