In poetry, what are "free verse" and "haiku"?

In poetry, 'free verse' is an open form of poetry, so there are no rhyming schemes, you can write whichever rhyme you want, and the meter (the accents and the number of syllables) is also random.

A 'haiku' is a short Japanese poem, consisting of 3 lines, where the first and last lines have 5 syllables, and the middle line 7.

Free Verse is when you write a poem without rhyme sceme or any certain type of form. A Haiku is when you have seventeen syllables in three lines of five, seven, five.