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In the countable sense, a verse is formally a single metrical line in a poetic composition. However, verse has come to represent any division or grouping of words in a poetic composition, with groupings traditionally having been referred to as stanzas.
In the uncountable (mass noun) sense verse refers to "poetry" as contrasted to prose. Where the common unit of verse is based on meter or rhyme, the common unit of prose is purely grammatical, such as a sentence or paragraph.
Types of verse
Of Man's first disobedience, and the fruit
Of that forbidden tree, whose mortal taste
Brought death into the World, and all our woe,
With loss of Eden, 'till one greater Man
—John Milton (from Paradise Lost)
Free verse is usually defined as having no fixed meter and no end rhyme. Although free verse may include end rhyme, it commonly does not.
Whirl up, sea—
Whirl your pointed pines,
Splash your great pines
On our rocks,
Hurl your green over us,
Cover us with your pools of fir.