Wireless Sensor Network (WSN) comprises of huge number of spatially distributed homogeneous or heterogeneous sensors. The application areas of WSN comprises of environmental monitoring, military surveillance, health care, industrial process control, home intelligence, security, remote metering and many more. As WSN continuously monitor the environment, target tracking proved out to be one of the most practical application of WSN. This paper reviews different techniques of target tracking for static as well as moving target. Energy efficiency and optimized allocation of sensor nodes are critical requirements to maximize the life time of sensor network.