World history is the study of human events, societies, and cultures from ancient times to the present. It encompasses significant developments such as the rise and fall of empires, the spread of religions like Christianity and Islam, and major inventions like the wheel and printing press. Key events include the Agricultural Revolution, which allowed people to settle and form communities, and the Industrial Revolution, which transformed economies and societies. World history also examines the impact of wars, such as World War I and World War II, and movements for civil rights and independence across the globe.