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== The block code and its parameters ==
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[[Error-correcting code]]s are used to [[reliability (computer networking)|reliably]] transmit [[digital data]] over unreliable [[communication channel]]s subject to [[channel noise]].
When a sender wants to transmit a possibly very long data stream using a block code, the sender breaks the stream up into pieces of some fixed size. Each such piece is called ''message'' and the procedure given by the block code encodes each message individually into a codeword, also called a ''block'' in the context of block codes. The sender then transmits all blocks to the receiver, who can in turn use some decoding mechanism to (hopefully) recover the original messages from the possibly corrupted received blocks.
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