Mobile ad-hoc network becomes a center of attraction in technological area now-a-days. Mobile Ad-hoc NETwork (MANET) is an “Infrastructure-less” network and hence can work in slow network area also. The node can communicate directly with other node available in network or can use mediator nodes to makes communication between source and destination. This paper deals with different routing protocols and issues of MANET. Also this paper includes security aspects of MANET, which is quite important to discuss about because MANET having dynamic topology and affected by lots of security threats.