Wireless Sensor Networks (WSNs) consist of small nodes with sensing, computation, and wireless communications capabilities. Many routing, power management, and data dissemination protocols have been specifically designed for WSNs where energy awareness is an essential design issue. The focus, however, has been given to the routing protocols which might differ depending on the application and network architecture. In this paper, we present a survey of the state-of-the-art routing techniques in WSNs. Wireless Sensor Network (WSNs) is a self-organized wireless network system which has enabled densely deployment of nodes. WSN is a prominent technology in collecting the data from the remote locations by interacting with the physical phenomena and depend on the collaborative effort by huge numbers of low cost sensor nodes. Typically, WSN comprises of large numbers of low cost, low power sensor nodes which are equipped with communication and low computation capabilities. A Sensor node is an electronic device that is capable of sensing the environment condition such as temperature, pressure, light, humidity and vibration etc.