Nowadays, using Wireless Sensor Network (WSN) became popular in many segments of human being life. For example in ecological life, environmental monitoring, conservation, manufacturing, business assets management, automation in transportation and health care issues. Implementing and processing such a WSN in one of the area requires disciplines, signal processing, networking and protocols, routings, embedded system, algorithms, mapping and scheduling. This book gives an overview about WSN briefly and issues several important key factors on an example. In order to show the trade- offs in WSNs, a simulation model has been created and several scenarios have been obtained.