Abstract: Mobile ad-hoc network (MANETs) is a type of wireless network which do not consist a base station for providing network connectivity. A mobile ad-hoc network (MANET) is a self-configuring, infrastructure less network. When MANET network used for large scale operation, MANET induce many drawbacks like delay in routing, resource consumption due to dynamic nature of MANET. Many cluster algorithm proposed by researcher to overcome this problem. Cluster technique used to splitting the network into Sub network called cluster. Every cluster has a its own cluster head which maintains a whole information about the cluster. Dynamic nature of MANET make difficult to divide a network into cluster and electing cluster head. In this paper we provide an overview of some clustering approaches and protocol used in Manet.

Keywords: MANET, Cluster, Clustering Protocol.