A scale model is a physical model, a representation or copy of an object that is larger or smaller than the actual size of the object, which seeks to maintain the relative proportions (the scale factor) of the physical size of the original object. Very often the scale model is used as a guide to making the object in full size. Scale models are built or collected for many reasons.

Professional modelmakers often create models for many professions:

Hobbyists or amateur modelmakers make die-cast models, injection molded, model railroads, remote control vehicles, wargaming and fantasy collectibles, model ships and ships in bottles for their own enjoyment.

Scale models can also be objects of art, either being created by artists or being rediscovered and transformed into art by artists.

Some modelers build and collect models made from a certain medium ( Metal, wood, plastic, card, paper, etc.). Others build and collect models based on the types of object being modeled.

Model aircraft are divided into two main groups: static and flying models.