20th-century analytic philosophy emerged as a response to 19th-century idealism, seeking a more rigorous approach to philosophical inquiry. Key figures like Russell, Moore, and Wittgenstein shaped its development, emphasizing logic, language analysis, and scientific methods. This movement introduced influential concepts like logical atomism, logical positivism, and ordinary language philosophy. It revolutionized philosophical methodology, impacting fields beyond philosophy and contributing to debates on knowledge, reality, ethics, and the nature of language.