Maria Callas was an iconic Greek-American opera singer who is widely regarded as one of the greatest sopranos of all time. She was known for her powerful and emotive voice, which earned her the nickname 'La Divina'. Callas was a major figure in the world of opera during the 1950s and 1960s, and she is remembered for her performances of works by composers such as Verdi, Puccini, and Bellini. Her career was cut short due to health issues, but her legacy lives on in the world of opera.