The Vienna Circle was a group of philosophers and scientists active in the early 20th century, primarily in Vienna, Austria. They were known for promoting logical positivism, a philosophy that emphasizes the importance of empirical evidence and scientific verification in the formation of knowledge. Key figures included Moritz Schlick, Rudolf Carnap, and Otto Neurath. The Circle sought to eliminate metaphysics and focus on statements that could be tested through observation and experimentation. Their work laid the groundwork for modern philosophy of science and influenced various fields, including linguistics, mathematics, and cognitive science.