(1) A group of bytes that is transmitted or processed as a single unit. See
block storage.
(2) A group of text characters marked for moving, copying or saving.
(3) A group of blockchain transactions. Blockchains store all transactions in blocks that are linked to each other. See
blockchain.
(4) A rectangular group of pixels that is processed as a unit.
(5) A group of program statements that is treated as a unit based on the results of a comparison.