Haiku (also called nature or seasonal haiku) is an unrhymed Japanese verse consisting of three unrhymed lines of five,
seven, and five syllables (5, 7, 5) or 17 syllables in all.
Haiku is usually written in the present tense and focuses on nature (seasons).
The 5/7/5 syllable rule is the
basic form, but there are variations, such as the Senryu and Tanka.