Vehicular Ad-hoc NETwork (VANET) is an ad hoc network of independent nodes moving freely in the network and coordinated by the Road Side Units (RSUs). Each node in the network represents vehicle, for instance car, provided with individual On-Board Unit (OBU) to communicate with other nodes. The nodes move in the dynamic network covering the range of 100 to 300 meters to connect to each other and form wireless network. It has become the key component of Intelligent Transportation System (ITS). Several renowned automobile companies endorse this term. In VANET, communication scenario can be V2V or V2I.