Blockchain

                        What is Blockchain ?  Blockchain is a technology used to make distributed system so that      no central power exist. We can understand this with an example -We all know in all major        democratic countries there is a central power and all states have            their own specific powers.But if there is no central power and all          states votes for every decision so no states can  do any thing without  others permission.So this is an example of distributed power and same is blockchain.