"Protestantism" is a study of the history, religious ideas and influence of Protestantism on the modern world. The author examines in detail the origin and development of the Protestant movement, dividing it into different denominations and trends. The book reveals key moments in the history of Protestantism, from Luther and the Reformation to contemporary trends in the Protestant Church. The author analyzes the ideological differences between Protestants and other Christian faiths, revealing the impact of Protestantism on society, culture and moral values. "Protestantism" is an inexhaustible source of knowledge about one of the most influential religious currents in world history.