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Blockchain can be simply defined as a distributed digital ledger that keeps track of all the transactions that have taken place in a secure, chronological and immutable way using peer-to-peer networking technology. The most known blockchain application is bitcoin that supports transactions of bitcoin transfer. However, blockchain is finding many uses in financial and non-financial applications; indeed, it is believed that blockchain will transform how we live, work, and interact. This talk will start with an introduction to Blockchain technology. It will show how Blockchain works. It will present the concept of smart contracts, which are critical in developing blockchain applications. It will also identify industry segments where blockchain can play a key role in solving existing issues. The talk will conclude by briefly overviewing our work at Montreal Blockchain Lab and our view on the future of blockchain.