A network without any central administration is known as an adhoc network. It consist mobile nodes that use a wireless interface to send packet data. The mobility of the nodes makes it difficult for ad hoc networks to have a fixed topology. Congestion is also a major concern in adhoc networks. This book addresses how congestion can be controlled by using a hybrid routing protocol. Simulation was the major research instrument used for this project. This book is important for network administrator and research community as a whole.