You will feel cool while seeing some robot cars are wandering around? It is very easy with a car platform, add some micro-controller (such as Arduino) and sensor modules, and program it. Then you made your own robot car. Chassis frame is a mechanical frame structure of a mini mobile robots, its like a backbone for simple robot. Easy to arrange/connect everything like motors, sensors, wheels, development board, studs, clamps , screws, etc. of a robot to it.