Margaret Thatcher was considered the "Iron Lady" for her strong leadership in the United Kingdom during the 1980s. As the first female Prime Minister, she served from 1979 to 1990 and was known for her uncompromising policies and charismatic leadership style. Thatcher implemented wide-ranging economic reforms, promoting free-market principles, privatization of state-owned industries, and a reduction in the power of trade unions. Her policies, often referred to as "Thatcherism," aimed to combat inflation, stimulate economic growth, and strengthen Britain’s global standing. Though polarizing, her tenure marked a significant shift in British politics and inspired conservative movements around the world.