Wireless Sensor Network (WSN) has been constantly emerging in the area of wireless communication system. Although Wireless Sensor Network has explored its identity in various remote communication system right from environmental monitoring, health monitoring, to industrial monitoring applications, but still the area is shrouded with some of the significant open issues. In the past decade, numerous attempts have been made to address the frequently occurring issues, but still the applicability of the solution are yet to be seen. This paper presents a state-of-art review of existing techniques of data fusion, which has not found its proportional significance compared to data aggregation among the research community. The paper discusses majority of the significant studies, in-depth analysis of their outcomes along with discussion of research gap at the end of the paper.
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