Blockchain Technology had the most effect on our ways of life in the most recent decade. Numerous individuals actually mistake Blockchain for Bit coin; however they are not the equivalent. Spot coin is an application that utilizes Blockchain innovation. Notwithstanding, as a dispersed innovation block chain as an amazing asset can be used for tremendous day by day life applications. There is a wide range of square chain applications going from digital money, hazard the executives, web of things (IoT), and monetary administrations to public and social administrations. Blockchain innovation has indicated its impressive versatility as of late as an assortment of market areas requires methods of incorporating its possibilities into their activities. Blockchain has various advantages, for example, decentralization, persistency, and secrecy and review capacity. There is a wide range of square chain applications going from digital currency, monetary administrations, hazard the executives, web of things IoT to public and social administrations. In spite of the fact that various examinations centre on utilizing the square chain innovation in different application viewpoints, there is no far reaching study on the square chain innovation in both mechanical and application points of view. To fill this hole, we direct an exhaustive overview on the square chain innovation. Specifically, this paper gives the square chain scientific categorization, presents run of the mill block chain agreement a calculation, surveys block chain applications and examines specialized difficulties just as late advances in handling the difficulties. Additionally, this paper likewise calls attention to the future bearings in the square chain innovation.