Wireless sensor networks are made up of a group of nodes that are spread out in an environment. Nodes in these networks have very limited energy sources, so they need to collect and send data efficiently. To send data in this way, energy-efficient routing protocols have to be used. The main purpose of these protocols is to save energy and make the network last longer while in routing. In this paper, we are reviewing some routing protocols that can be used to make wireless sensor networks energy-efficient. (Abstract)

Keywords : Energy Efficient, Wireless Sensor Networks (WSN), Routing Protocols