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A wireless sensor network is used for a variety of important applications in remote monitoring and target tracking. Recently, sensors have been manufactured to be smaller, cheaper, more intelligent, and equipped and interfaced wirelessly within a network for communication purposes. The infrastructure of wireless sensor networks depends on application design structure, objectives, cost, hardware, and other maintenance constraints; sometimes, it even varies based on weather conditions. This chapter reviews the technological development of wireless sensor networks, with special attention to the issues of connectivity and reliability.