VANET is a highly mobile wireless Adhoc network in which vehicles are simulated as nodes. It is a distributed and self-organized network without need for an infrastructure. The communication between the vehicles is normally accomplished through special electronic devices so that an Adhoc network of the vehicles is formed on the road. The goal of VANET is to achieve inter-vehicle communication and to provide safety and traffic management applications for the road users to enhance the efficiency of the transportation systems. Routing plays a vital role in communication between the vehicles in the network. The performance of the mobile environment is determined by routing protocol. This article presents the architecture, characteristics, applications, routing protocol and the simulation tools used to evaluate the performance of the routing protocol and the performance is evaluated in NS2 in terms of delivery ratio.