Abstract: Mobile Ad-hoc Networks (MANETs) have dynamic and unpredictable environment. In MANETs nodes are movable and there is no centralized management. Hence, routing is an important factor in MANETs which works well in small networks as well as in the network which expanded dynamically. MANETs have several challenges such as link connectivity, congestion, routing, QoS, Power (Energy) consumption, interference etc. and routing in MANETs is a main factor considered among all these issues. In MANETs There are two variations in routing – unipath and multipath routing. Multipath routing scheme is superior to traditional unipath routing scheme. All routing protocols in MANETs are by virtue unipath routing protocols. Standard unipath routing protocols in ad-hoc networks, such as Ad-hoc on demand Distance Vector (AODV) and Dynamic Source Routing (DSR) are mainly intended to discover a single route between source and destination. Unipath routing protocols needs modification, optimization and alteration to formulate multipath routing protocol. In this paper, multipath routing protocols are surveyed and it further thoroughly investigates performance of MANETs.