Answer:
Shakespearean sonnet.
Explanation:
The English sonnets, also called Shakespearean sonnets or Elizabethan sonnets, are poems with a long tradition that goes back to the Renaissance time period and that were, arguably, brought to perfection by Shakespeare. The structure of these poems consists of three quatrains (four-line stanzas) and a final couplet, all composed in iambic pentameter. These poems usually present an idea that is reversed or turned around on the third quatrain that is resolved in a novel way in the final couplet.
