The book "The Origin of Species by Natural Selection, or The Preservation of Favorite Races in the Struggle for Life, 6th Edition" by Charles Darwin is one of the most iconic works in the history of science. Darwin examines the theory of evolution in detail, highlighting the role of natural selection in the formation of species diversity. The author substantiates how natural selection acts as a mechanism that leads to the adaptation of species to the conditions of the surrounding environment. This edition is the 6th and is the last time of the author's life. The book offers readers a unique perspective on understanding the development of life on Earth and is relevant to this day.