Wireless Sensor Networks (WSNs) are composed of sensor nodes usually called as motes organized in a cooperative network. These networks are especially cooperative because motes collect data from environment and the data is passed through network. Further data is collected at base station for processing. The networks are installed in rough environments and where traditional networks are not possible to function well. Such installation is called as deployment. Generally there are three issues of research in wireless sensor networks like deployment, operation and security. WSNs got high popularity due to broad range of applications. These networks have attracted tremendous researchers due to their unique characteristics that differ them from traditional wired networks.