ABSTRACT Recent advancement in wireless communications and electronics has enabled the development of low-cost sensor networks Here we describe the three major aspect of wireless sensor network.WSN Applications, Routing and clustering. In the field of a wide variety in WSN applications we specifically introduce Environmental applications, Military Applications and SHM systems in health monitoring scope. The introduction of the routing protocols with the head topics of Flooding, Gossiping, EAGR, GEAR and REAR take place in routing section
