A dodecahedron is a three-dimensional shape that has twelve flat faces, each shaped like a regular pentagon. It is one of the five Platonic solids, which are unique shapes where each face is the same and the same number of faces meet at each vertex. The dodecahedron has 20 vertices and 30 edges, making it a complex yet symmetrical structure. In geometry, the dodecahedron is often studied for its properties and relationships to other shapes. It can be found in various fields, including architecture and art, and is sometimes used in games, such as Dungeons & Dragons, where it serves as a twenty-sided die.