Wireless Networking is a technology in which number of mobile nodes can communicate with each other directly or indirectly through wireless links. A sensor network is composed of a large number of sensor nodes and a sink. In the wireless sensor networks the main problem is limited battery life used by sensor nodes because the size of sensor nodes is small so constraints are there like battery size, processor, storage for data, these all are small as sensor nodes Routing protocols of sensor networks are dependable for handles the routes in the networks. This paper surveys current routing protocols for sensor networks and present a categorization for the various approaches pursued and contrast their strength and constraint.

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Routing in MANETs is a one of the dynamically and demanding task and has received a great amount of awareness from researchers around the globe. To overcome this problem, a various number of routing classes have been introduced and the number is still rising day by day fastly. It is quite hard to decide which protocols or routing classes may do well under an amount of diverse network scenarios such as network volume and network topology etc. In this paper, we present a summary of a large range of the existing routing classes with a particular focus on their uniqueness and their functionality. Also, the judgment is provided based on the routing functionality and information is used to build routing decisions. The presentation of all the routing protocols or classes is also discussed. Further this study will assist the researchers to get a summary of the existing classes and advice which protocols may execute better with respect to varying between network scenarios.The design of routing protocol for MANET is tricky because of numerous network limitations. MANET experience from the restrictions of several network resources, for examples, energy, bandwidth, processor, and storage. The aim of challenges in sensor networks involves the following main aspects . Dynamic topologyNodes are free to move arbitrarily in any direction thus the topology of the network change unpredictably. Limited BandwidthThe bandwidth available for wireless networks is generally low than that of wired networks. The throughput of these networks is generally low due various noises, fading effects. Energy constrained operationThe nodes are portable devices and are dependent on batteries. This is the most important design consideration of the MANET

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