Block chain technology is the publicly distributed ledger system which records all the crypto currency transactions all through out the globe and every one can view the transactions recorded in the block chain system which makes it easier for further auditing. Block chain system all the transactions are recorded in a clear and system way so no one will be able to manipulate the block chain system as it is a system generated technology or can be called the decentralized  which does not have any central authority for controlling the system. I think you understand now