In terms of pithy summaries - this description of Comonads seems to win - describing them as a 'type for input impurity'.
What is an equivalent pithy (one-sentence) description for codata?
Pithy summary for codata (Where a comonad is a 'type for input impurity')
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"Codata are types inhabited by values that may be infinite"
This contrasts with "data" which is inhabited only by finite values. For example, if we take the "data" definition of lists, it is inhabited by lists of finite length (as in ML), but if we take the "codata" definition it is inhabited also by infinite length lists (as in Haskell, e.g.
x = 1 : x).Comonads and codata are not necessarily related (although perhaps some might think so due to Kieburtz' paper Comonads and codata in Haskell).