In this book the routing tactic of data packets in Wireless Sensor Networks are discussed in detail and classification of data routing algorithm which can be realized in a Wireless sensor networks as well as shortcoming linked to them are discussed. Routing is a phenomenon of finding a path between source and destination when data transmission request is made. In Wireless Sensor Networks, network layer is primarily used to pertain the routing of the incoming data. This book presents a routing method for communication among nodes and base station in Wireless Sensor Network.