Nippon Telegraph and Telephone Corporation, commonly known as NTT, is a major telecommunications company based in Japan. Established in 1952, it provides a wide range of services, including fixed-line and mobile phone services, internet connectivity, and data communications. NTT plays a crucial role in Japan's telecommunications infrastructure and is one of the largest companies in the industry globally. The corporation operates through several subsidiaries, including NTT Docomo, which focuses on mobile services, and NTT Communications, which offers data and cloud services. NTT is also involved in research and development, contributing to advancements in telecommunications technology and network solutions.