Iran was formerly known as Persia until 1935. It was a kingdom for about 2600 years before becoming an Islamic Republic in 1979. The country has a population of over 66 million people, most of whom are Persian or speak Persian. Some key cities include Tehran, Mashhad, Isfahan, and Shiraz. Iran has a long history and culture, and is known for industries like oil and gas as well as traditions like Noruz, wrestling, and foods like kebabs.