Mobile ad hoc networks (MANETs) are temporal networks consists of wireless interface, dynamic connection establishment without pre-existing infrastructure, low power, dynamic topology and self organized nodes. Security and reliability play major role on selection of a node for packet forwarding. So in this Dissertation, I proposed an algorithm to select the best-fit next node and that would be efficient in power and adaptive too i.e "An Efficient Power Saving Adaptive Routing Protocol (EPSAR) for Mobile Ad Hoc Network." This algorithm is novel, because it selects the next node which is farthest, reliable and efficient at the same time with minimum computation requirement.I simulated this by considering and analyzing the different wireless technologies used for MANETs. To work with EPSAR I have chosen two protocols i.e. AODV (Ad hoc on-Demand Distance Vector Routing) i.e reactive routing and DSDV (Destination-Sequenced Distance Vector) i.e proactive routing and also have taken the the scenarios on the bases of number of nodes (for AODV it is 10, 20, 30 and 50; for DSDV it is 05).