问题：

What is Sonnet?

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答案：

The Italian sonnet (also called Petrarchan sonnet) is a series of 14-line poem which comprises an 8-line ‘octave’ of two quatrains, rhymed abbaabba, followed by a 6-line ‘sestet’ usually rhymed cdecde or cdcdcd. The transition from octave to sestet usually coincides with a ‘turn’ in the argument or mood of the poem. The English sonnet (also called the Shakespearean sonnet after its foremost practitioner) comprises three quatrains and a final couplet, rhyming ababcdcdefefgg. An important variant of this is the Spenserian sonnet, which links the three quatrains by rhyme. In the sequence ababbcbccdcdee. In either form, the ‘turn’ comes with the final couplet, which may sometimes achieve the neatness of an epigram.