Mobile Ad hoc NETworks (MANETs) does not possess any fixed infrastructure. Due to mobility of nodes and frequent link breakage carry out, no central administrator is required. Hence, in MANETs routing is challenging job and it generating multiple types of routing protocols. In this paper, the author describes on reactive routing techniques that have the major challenges in ad hoc networks. Therefore, to determine the actual suitability of the proactive routing protocol for MANET is very difficult for different network conditions. At this point, they suggests about comparison of various reactive routing protocol regarding the efficiency of the network.