Warhammer allows you to fight battles with armies of troops, war machines and monstrous beings. It is up to you as the commander of your forces to find the best way to use your cavalry and infantry to achieve victory.
The Citadel miniatures used to play Warhammer are simply referred to as models in the rules that follow. Each model is an individual playing piece with its own capabilities and characteristics.
A unit usually consists of several models (cavalry or infantry) that have banded together, but a single, powerful model such as a lone character, a chariot or a Dragon, a war machine and its crew, etc, are also considered to be a unit.