Flying ad hoc networks (FANETs) are a particular type of ad hoc networks, which constitute flying nodes communicating with each other in ad hoc mode.Routing among FANETs has been a subject of interest due to the inherent challenge of handling dynamicity exhibited by the nodes. This survey presents a comprehensive review on recently developed routing protocols for FANETs. In the initial part of this paper, a basic overview of FANETs, their differences with respect to mobile ad hoc networks and vehicular ad hoc networks, evolution of FANET routing protocols, basic categorization of routing protocols, characteristics and design considerations for FANETs, has been presented. Then, an in-depth study of recently developed FANET routing protocols has been carried out by categorically differentiating them based on their routing mechanism, highlighting their features, strengths, weaknesses, and Quality of Service (QoS) parameters used for testing, in order to identify their suitability for routing data among flying nodes moving at high speeds. Furthermore, a feature comparison of all the discussed protocols has been presented in a summarized form. Lately, an analysis of mobility models, QoS parameters, simulators, and test beds used in the literature has been discussed in order to reflect their effectiveness when used for FANETs. Finally, open issues and future directions related to FANET routing protocols have been mentioned so as to direct the future research in this area for further advancements.

VANET as Inter-vehicle communication is becoming a promising area of research, standardization, and growth with the ever-growing number of vehicles equipped with computer technology and wireless communication tools. Due to its erratic portability and the interrupted availability of a network, VANET is relatively incomprehensible for a strong end to end communication, In Vehicular Network the main advantage is that it communicates by using nodes. Because of its simple and basic method of communication, MANET is used most often in the military, just like data sharing between different computers. VANET and some modifications are identical to MANET. VANET encompass the mobile nodes which are indicated as (MN), The vehicle networking system has drawn significant interest from academia and industry since its establishment. Its technology is used for military purposes by several foreign manufacturing and government sectors, it also enables a wide range of applications, including collision prevention, security, blind crossing, dynamic route planning, traffic condition monitoring on a real-time basis, etc but there are certain loopholes or drawbacks like frequent network drop, high mobility which affected the overall QoS, In this paper, there are brief analyses on Quality of Service which include certain Routing Protocol like DIVERT, FBAODV, DSR and also to decrease the congestion control, there is a comparative study of the different protocol which evaluates in increasing the throughput and network efficiency.

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