Poetry that does not follow a specific form and does not have a set rhyme pattern is known as a haiku a villanelle a free verse an elizabethan sonnet

Free verse.

Explanation:

Free verse is a form of poetry that does not follow consistent meter patterns, an established rhythm, or literary conventions, although, in the written page, it does resemble other forms of metered poetry. This form of verse became popularized in the second half of the 19th century through the works of great poets like Baudelaire, Verlaine, Mallarmé and Rimbaud. Even though free verse does not conform to any literary convention, it does not lack musicality and rhythm, though it is of a different and perhaps more challenging nature.