We make use of global ledger and information or transactions are recorded as blocks in blockchain world. When a block is filled up with a certain number of information, the block is validated via group consensus and then it is chained to a stack of previously validated blocks. Each block on that stack is considered to be trustworthy because, once a block is validated, it can’t be altered. The action of embedding a preceding block of information into the present block of information is called chaining, henceforth, the name blockchain is used.
Furthermore, we might think what makes this blockchain incredibly powerful. It is because all the blocks are linked together in a way that if someone goes back and modify any information on any blocks along the blockchain then the break link is easily determinable. This crucial property of blockchain is known as “immutability” and this offers blockchain the sense of security that we rely on.