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===Practical definition===
A '''block code''' is the primary type of [[channel coding]] which was used in earlier [[mobile communication]] systems. Simply it adds [[redundancy (information theory)|redundancy]] in order that at the receiver, one can decode with (theoretical) probability of zero errors, provided that the [[information rate]] (amount of transported [[information]] in [[bit]]s per sec) would not exceed the [[channel capacity]].
The main characterisation of a block code is that it is a ''fixed length'' channel code (unlike source coding schemes such as [[Huffman coding]], and unlike channel coding methods like [[convolutional code|convolutional encoding]]). Typically, a block code takes a ''k''-digit information word, and transforms this into an ''n''-digit codeword.
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