As the definition goes Defensive driving is a more advanced form of training that drivers can take, over and above the mastery of the rules of the road, and the basic mechanics of driving. Its aim is to reduce the risk of driving by proactively avoiding dangerous situations. This can be achieved through adherence to a variety of general purpose rules, as well as the practice of specific driving safety techniques.

Talking in much simpler terminology, drive with due caution, care and courtesy. Caution implies to be anticipative from the aggressive drivers. Care refers to be careful from the obstacles (pets, children etc..) you encounter on roads and highways. Finally, courtesy directs you to