WSN Protocols, Research challenges in WSN, Integrated areas of sensor networks, security attacks in WSN

Wireless Sensor Networks (WSNs) are widely used nowadays for seamless data transfer from one sensor node to others using the wireless channel. The term routing means sending the data packets from a source node to the destination node. There exist various routing protocols that ensure the efficient delivery of data from source to destination in terms of distance, energy and Received Signal Strength Indicator etc. In this paper various WSN routing protocols are reviewed to identify gap in study.