When a new transaction is entered, data is sent to a network of computers located all over the world. The network of computers attempts to solve equations to confirm the validity of the transaction. Blockchains incentivise this by providing these solvers with their tokens or other benefits. 

Once the transaction is confirmed to be legitimate, they are fit together into blocks. These blocks are then joined together to create a history of all transactions that have occured and are immutable – a Blockchain. From here, the transaction is complete.