The American Telephone and Telegraph Company (AT&T) is a major telecommunications company in the United States. Founded in 1885, it originally served as the parent company of the Bell System, which provided telephone services across the country. AT&T has played a significant role in the development of communication technologies, including the transition from analog to digital systems. Over the years, AT&T has expanded its services to include mobile phone networks, internet services, and television offerings. The company has undergone various mergers and acquisitions, making it one of the largest telecommunications providers in the world, impacting how people connect and communicate today.