VANET is an intelligent transportation system that has been developed for automatic driven vehicles. In the process of VANET vehicles have been communicated with road side unit, and other vehicles that are available on the roads. In this paper various approaches that are responsible for communication in VANET has been discussed. In VANET various approaches that are used for communication are location based, ID based or MAC based. On the basis of these approaches V2V (vehicle to vehicle), V2R (vehicle to Road Side Unit) and R2R (Road Side Unit to Road Side Unit) is possible. Vehicles have been used for sharing of different locations and vehicles density on road.