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The advancement in technology coupled with the increasing use of wireless networks has brought to light the development of Body Area Networks. Body Area Network is designed to provide a platform for continuous health monitoring of patients and sometimes application of medication. Although BAN standards are been designed for medical purposes, its usefulness covers a range of applications. This thesis offers a general overview of wireless networks. Firstly it focused on BAN positioning and requirements. Then, followed by BAN standardization and communication. A further detailed analysis of frame processing of Media Access Control specified by IEEE 802.15.6 and the physical layer is discussed. Finally, the current and future applications of BAN are summarized, providing a comprehensive review of BAN.