A verse is formally a single metrical line in a poetic composition. However, verse has come to represent any grouping of lines in a poetic composition, with groupings traditionally having been referred to as stanzas. Verse in the uncountable (mass noun) sense refers to poetry in contrast 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. Verse in the second sense is also used pejoratively in contrast to poetry to suggest work that is too pedestrian or too incompetent to be classed as poetry. Source: Wikipedia (en)