AT&T Corp., originally the
American Telephone and Telegraph Company, is the subsidiary of
AT&T that provides voice, video, data, and
Internet telecommunications and professional services to
businesses,
consumers, and government agencies. During its long history, AT&T was at times the world's largest
telephone company, the world's largest
cable television operator, and a regulated
monopoly. At its peak in the 1950s and 1960s, it employed one million people and its revenue was roughly $3 billion annually.