The driving form refers to the arrangement of the engine and the form of the number and position of the driving wheels. FF is front wheel drive with front engine. FR is front-engine rear-wheel drive. Mid-engine rear-wheel drive. 4WD is four-wheel drive. AWD is a full-time four-wheel drive.
The advantage of a front engine is that it is easy to maintain and less expensive than a mid-engine. The mid-engined car has a well-balanced front and rear weight for handling.