"Leaves of Grass" is a collection of poems written by Walt Whitman and first published in 1855. It is widely considered one of the most influential works of American poetry, and is recognized as a landmark in the history of American literature. The book is known for its celebration of nature, democracy, and the individual spirit, and for its innovative use of free verse, which was a departure from traditional rhymed and metered poetry of the time.

In "Leaves of Grass," Whitman writes about a wide range of subjects, including the natural world, love, death, and the human experience. He uses vivid imagery and powerful language to convey his messages, and his poems often blur the lines between the personal and the universal. The book is also notable for its frank discussion of sexuality, which was a bold move in an era when such topics were often taboo.

The first edition of "Leaves of Grass" contained only 12 poems, but over the course of his life, Whitman continued to revise and expand the collection, eventually publishing several editions with hundreds of poems. Despite its initial controversial reception, "Leaves of Grass" has since become a beloved classic, inspiring generations of writers and influencing the development of modern American poetry.

Overall, "Leaves of Grass" is a rich and diverse collection of poetry that explores themes of nature, democracy, individualism, and the human experience with depth and beauty. It remains an important work of American literature, and continues to be widely read and studied today.