It is a poem written in a certain format and rules. It has strict rules on the number of lines, the number of words (or syllables), the tone and rhyme, the antithesis of words and the arrangement of sentence patterns. For example, China's ancient poems, quatrains, words and songs, and European sonnets.
Free verse
It is a newly developed poetic style in modern Europe and America. It is not limited by metrical rules, has no fixed format, pays attention to natural and internal rhythm, and uses rhymes roughly similar or without rhymes. The number of words, lines, sentence patterns and tones are relatively free, and the language is relatively popular. Whitman, an American poet (1819-1892), is the founder of European and American free verse, and Leaves of Grass is his main collection of poems. This poetic style has also become popular in China since the May 4th Movement.
Poetry in prose
It is a literary genre with the characteristics of both prose and poetry. There are poetic artistic conception and passion in the works, which are often full of philosophy, paying attention to the rhythm of nature and the beauty of music. The length is short, like prose, without branches and rhyme.