haiku has a structure of three lines and then five seven and five syllables. Haiku's were originated in japan by Basho Matsuo in 1644. Haiku's don't need to ryhme rhyme and don't need complicated words in them.  Haiku's are basically just short simple poems about nature that try to make a picture in your mind.

Over the wintry
forest, winds howl in rage
with no leaves to blow.

Natsume Soseki