A diorama is a replica of a scene, typically a three-dimensional model either full-sized or miniature. Sometimes it is enclosed in a glass showcase for a museum. Dioramas are often built by hobbyists as part of related hobbies such as military vehicle modeling, miniature figure modeling, or aircraft modeling.

Model military vehicles range in size and complexity; from simplified small-scale models for wargaming, to large, super-detailed renditions of specific real-life vehicles.