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A couplet is a pair of lines of verse that rhyme.
Poetry in couplets is one of the simplest rhyme schemes:
This scheme was used in Chaucer's Canterbury Tales in the 14th century and became popular again in the eighteenth century with poets such as Dryden and Alexander Pope. Couplets with a meter of iambic pentameter are called heroic couplets.
Couplets can also play a role in more complex rhyme schemes. For example, Shakespearean sonnets end with a couplet.