A Mobile Ad-hoc NETwork (MANET) is a collection of two or more devices or nodes or terminals with wireless communication mobile ad hoc wireless network and networking capability that communicate with each other without the aid of any centralized administrator also the wireless nodes that can dynamically form a network to exchange information without using any existing fixed network infrastructure. And it’s an autonomous system in which mobile hosts connected by wireless links are free to be dynamically and same time act as routers at the same time and the authors discuss in this paper with basic introduction of MANET and its pros and cons.