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AT&T Inc., commonly known as AT&T, is an American multinational telecommunications holding company. It is one of the largest telecommunications providers in the United States, offering wireless communications, fixed broadband and fiber services, and pay-TV, as well as enterprise networking and related services. The company is headquartered in Dallas, Texas.

AT&T traces its origins to the Bell System, built by the American Telephone & Telegraph Company. After the 1984 breakup of the Bell System, AT&T continued as a long-distance carrier and parent company. In 2005, SBC Communications acquired AT&T Corp and adopted the AT&T name. Since then, AT&T expanded through major acquisitions, including the wireless carrier AT&T Mobility, DirecTV in 2015, and Time Warner in 2018, which brought a large media and entertainment footprint under the umbrella as WarnerMedia.

In 2022, AT&T completed the spin‑off of WarnerMedia and merged it with Discovery to form Warner Bros. Discovery, in which AT&T retained a minority stake. The spinoff marked a shift in AT&T’s strategy toward focusing on core telecommunications services. Following the transaction, AT&T reorganized its structure around its primary communications operations, including wireless networks, fiber-based broadband, and business solutions, under brands such as AT&T Mobility and AT&T Business.

In the 2020s, AT&T has emphasized investments in 5G network deployment and fiber infrastructure to compete with other US carriers and to support digital services for consumer and enterprise customers. The company has historically carried significant debt from prior acquisitions and remains subject to regulatory and competitive pressures in the evolving telecommunications market. AT&T trades on the New York Stock Exchange under the ticker T.