Wireless sensor devices have a huge range of usage in observation, watch and ward etc. Unlike ad hoc networks, WSNs are limited through sensors’ restricted power, energy and computational ability. Sensor nodes don’t have mondial ID cause of the huge quantity of overhead and giant number of sensors. The responsibility of every sensor node is to recognize the changes in its particular region or area. Localization of a sensor node is carrying through with the aids of nearest nodes. The localization ways can be alienated into two parts namely ranges free and range based method.Keywords: WSN, localization, network, sensor nodes, robots
