flow cat, the scat is in the waves
and the dames are riding
checkered yellow cars
yearning for a fare;
but what's fair when your
rhythm's unmetered and your
rhyme is unnecessary,
just occasionally there?
While Free Verse does not rely on the conventional use of meter or rhyme, at the core its words flow in an irregular rhythmic cadence. Subject matter, effect, and tone vary greatly across the style.
The French poets of the late nineteenth century revolted against the tyranny of strict versification and established the Verse libre movement.
For more information on this or other forms, see these links