"Walden" is a book written by Henry David Thoreau, published in 1854. It is a reflection on simple living in natural surroundings, based on Thoreau's experiment of living in a cabin near Walden Pond in Concord, Massachusetts. The work explores themes of self-sufficiency, nature, and individualism. In "Walden," Thoreau emphasizes the importance of connecting with nature and finding personal fulfillment outside of societal expectations. The book is divided into several chapters, each addressing different aspects of life, such as solitude, economy, and the beauty of the natural world. It remains a significant work in American literature and philosophy.