The Persian language is classified as a continuation of Middle Persian, the official religious and literary language of the Sasanian Empire, itself a continuation of Old Persian, the language of the Achaemenid Empire. Its grammar is similar to that of many contemporary European languages. A Persian-speaking person may be referred to as Persophone.
There are approximately 110 million Persian speakers worldwide, with the language holding official status in Iran, Afghanistan, and Tajikistan. For centuries, Persian has also been a prestigious cultural language in other regions of Western Asia, Central Asia, and South Asia by the various empires based in the regions.
Persian has had a considerable (mainly lexical) influence on neighboring languages, particularly the Turkic languages in Central Asia, Caucasus, and Anatolia, neighboring Iranian languages, as well as Armenian, Georgian, and Indo-Aryan languages, especially Urdu (a register of Hindustani). It also exerted some influence on Arabic, particularly Bahrani Arabic, while borrowing much vocabulary from it after the Arab conquest of Iran.
With a long history of literature in the form of Middle Persian before Islam, Persian was the first language in the Muslim world to break through Arabic's monopoly on writing, and the writing of poetry in Persian was established as a court tradition in many eastern courts. Some of the famous works of Persian literature are the Shahnameh of Ferdowsi, the works of Rumi, the Rubaiyat of Omar Khayyam, the Panj Ganj of Nizami Ganjavi, the Divān of Hafez and the two miscellanea of prose and verse by Saadi Shirazi, the Gulistan and the Bustan.
Persian is one of the Western Iranian languages within the Indo-European family. Other Western Iranian languages are the Kurdish languages, Gilaki, Mazanderani, Talysh, and Balochi. Persian is classified as a member of the Southwestern subgroup within Western Iranian along with Lari, Kumzari, and Luri.