What are some similarities and differences between haiku and free verse? I need at least three points for each.

First,
neitherorrely on end rhymes or a set meter for their effect. Second, both are often used to
convey emotion. Third, both often have longing or a love of nature as themes.

A main difference, however, is that haiku is a very formal, rigidly proscribed poetic
form. It must be exactly seventeen syllables (at least in the English haiku traditionJapanese
haiku can have different forms). While it has no set meter, it does require five syllables in
the first line, seven in the second, and five in the third. Also, unlike haiku, free verse can
be fully narrativeit can allow the poet to tell a long story. Further, some free verse can be
mistaken for prose, but haiku is always recognizably haiku.

The concision
required by haiku forces the poet to concentrate on one point and remove all that is extraneous,
which can lead to poems of strong emotional impact. Free verse, by liberating the poet from any
artificial constraints of rhyme or meter, can also, albeit through opposite means (lack of rigid
structure), allow the poet the opportunity to write poems of great impact. Interestingly, free
verse poems of the Imagist school, such as William Carlos Williams's "The Red
Wheelbarrow," imitate the concision, if not the exact form, of haiku.