What are continuous tracks also called?
Continuous tracks — also called "caterpillar tracks" — move tanks by a system of metal plates that are linked together and driven by wheels. Compared to the rubber tires on a regular car or truck, continuous tracks have a much larger surface area.
The larger surface area of continuous tracks spreads a tank's heavy weight over much more ground area. This allows a tank to travel on many types of rough or soft terrain without sinking or becoming stuck.
The treads of the metal plates that make up caterpillar tracks are very tough. They provide good traction and are much more reliable than rubber tires would be.