Blockchain is one of the most important technical invention in the recent years. Blockchain is a transparent money exchange system that has transformed the way a business is conducted. Companies and tech giants have started investing significantly in the blockchain market and it is expected to be net worth of more than 3 trillion dollars in next 5 years. It has become growing popular because of its irrefutable security and ability to provide complete solution to digital identity issues. It is a digital ledger in a peer to peer network. This presentation provides a background on Blockchain technology, history, it’s architecture, how it works, advantages and disadvantages and its application in different industries.