VANET is a special type of MANET, where in vehicles act as nodes. Not like MANET, vehicles move on predefined roads, vehicles speed is determined by the velocity signs and additionally these vehicles additionally must comply with road traffic signs and road traffic signals. There are numerous challenges in VANET which can be wanted to be solved to be able to provide reliable offerings. Steady & reliable routing in VANET is likely one of the fundamental disorders. Accordingly, more study is

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... d to be carried out in an effort to make VANET more relevant. As vehicles have dynamic conduct, excessive velocity and mobility that make routing much more difficult. In this paper, presenting a brief study on VANET its characteristics, types of routing protocols, Trust models and its security. The unique characteristics of VANETs include: a. High Mobility: The nodes (vehicle) in VANETs usually are moving at high speed. The node motion is constrained by the road topology and layout b. Rapidly Changing Network Topology: Due to high node mobility, the network topology in VANETs tends to change frequently. c. Unbounded Network Size: VANETs could involve the vehicles in one city, several cities, or even a country. So the VANETs network should not be dependent on the number of the nodes. d. Anonymous Naming: Most applications in VANETs require identification of the vehicles in a certain region, instead of the specific vehicles. So, anonymous naming system should be followed to protect the privacy of the driver.