The characteristic of a wireless network which constructs a temporary network on demand through self-configured parameters over a group of a wireless device in its communication range defines the Mobile Ad Hoc Network

The Mobile Ad hoc Network (MANET) constructs the limited range wireless communications model in which nodes construct a temporary network and communicate with each other. It's communication completely depends on the intermediate nodes and the bandwidth they can provide. As the resources, routes, and bandwidth are limited MANET finds difficulties for communication when high traffic occurs and cause congestion. Congestion is one of the essential problems being identified in MANET as it reduces the network performance. The real-time data transmission in MANET is relying on the traditional TCP protocol which does not manage the congestion efficiently. However, congestion control techniques utilized through TCP are insufficient for this kind of networks due to node mobility and dynamic topology changes. In this paper, we present a review of the congestion control technique of MANET and how effective TCP congestion control and queue management are in managing and maintaining network congestion. We also explore the existing approaches and their approaches in congestion control over MANET.