Vehicular Adhoc Networks (VANET) is an emerging and significant technology which brings in new application fields such as traffic safety and security. Besides VANETs naturally have frequent challenges, like these nodes speeds are variable in nature and the infrastructure is decentralized, which means that those networks need very strong security systems to perform well. Such research study is focused on the analysis of the routing protocols, the use of the applications, the current challenges and security requirements in VANETs, which is terminated with the proposal of innovative solutions designed to ameliorate network performance and minimize the security risks. In particular, it involves location verification which is based on blockchains and making use of geographic routing and reliability tests to assert that the transmission data is secure. Moreover, a secure protocol will be suggested in order to decrease routing overhead and guarantee confidentiality of messages among vehicles that are specified in a group. Conclusively, this study takes the lead in making advancement in the VANET security as it gives the foundation for research to be conducted in this critical area.