4-polytope

A 4-polytope is a shape that has four sides. It is like a square, but instead of just four flat sides, it can have four curved, 3-dimensional sides. A 4-polytope can look like a cube, but it can also have different shapes. It can have four corners, like a square or a cube, or it can have six corners, like a pyramid. There can also be different kinds of 4-polytopes like a hexagonal prism or a rhombic dodecahedron.