Sonnet

Sonnet is a lyric form that has been popular since the Italian poet Petrarch perfected it. Sonnets have written in groups, called, naturally enough, sonnet sequences. It is composed of fourteen iambic pentameter lines.

Two kinds of Sonnet
Italian or Miltonic and the Shakespearean
Italian form maybe divided into an octet (the first eight lines) and a sestet (the remaining six lies) and the final couplet, which is often an epigrammatic summary of the idea of the sonnet.
Shakespearean sonnet rhymes a b a b, c d c d, e f e f, g g .