What is the differently between sonnet and haiku?

Answer 1

Sonnets are fourteen lines long, usually divided into an eight line octet and a six-line sestet (often with a change of subject or perspective between them called a volta), or alternatively into three four-line quatrains and a rhyming couplet.

Haiku are much shorter poems, often containing three lines of 5, 7 and 5 syllables (or when in Japanese, what passes for syllables in that language). Classic haiku do not develop an intellectual theme as sonnets tend to do, but rather provide a snapshot of an image, often from nature, which illustrates or gives rise to reflection on, a more abstract principle.