MANET is the field of communication that has been used for communication over the network. MANET is state free that has no structure for information sharing. In MANET nodes that have been mobile in nature has been act as sender as well as gateway for message forwarding. In this process of MANET various approaches have been used for message transmission. In this paper a review has been done that has been used for data transmission from sender to destination. Routing protocol is responsible for path establishment that is based on proactive and reactive routing. Various routing protocol has been designed that are used for malicious node detection and data communication on the network. In this paper a study has been discussed about these routing protocols.