Persian (/ˈpɜːrʒən/ or /ˈpɜːrʃən/), also known by its endonym Farsi (فارسی fārsi [fɒːɾˈsiː]), is the predominant modern descendant of Old Persian, is one of the Western Iranian languages within the Indo-Iranian branch of the Indo-European language family. It is primarily spoken in Iran, Afghanistan (officially known as Dari since 1958 for political reasons), and Tajikistan (officially known as Tajiki since the Soviet era for political reasons), and some other regions which historically were Persianate societies.