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BT, formerly known as British Telecommunications, is a multinational telecommunications company based in the United Kingdom. It is one of the largest telecommunications companies in the world, providing a wide range of services including fixed-line, mobile, broadband, and TV services to customers in over 180 countries. BT also operates a global network of data centers and offers IT services to businesses and organizations. The company has a long history dating back to the 19th century, and has been at the forefront of technological innovation in the telecommunications industry. BT is also involved in research and development in areas such as 5G, artificial intelligence, and cybersecurity.