Persian (/ˈpɜrʒən/ or /ˈpɜrʃən/; فارسی fārsi [fɒːɾˈsiː] is the predominant modern descendant of Old Persian, a southwestern Iranian language within the Indo-Iranian branch of the Indo-European languages. It is primarily spoken in Iran, Afghanistan (officially known as Dari Persian since 1958 for political reasons), and Tajikistan (officially known as Tajiki Persian since the Soviet era for political reasons), and some other regions which historically came under Persian influence. The Persian language is classified as a continuation of Middle Persian, the official religious and literary language of Sassanid Persia, itself a continuation of Old Persian, the language of the Achaemenid Persian Empire. Persian is a pluricentric language and its grammar is similar to that of many contemporary European languages. Persian is so-called due to its origin from the capital of the Achaemenid empire, Persis (Fars or Pars) hence the name Persian (Farsi or Parsi).
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. It also exerted some influence on Arabic, particularly Bahraini Arabic, while borrowing much vocabulary from it after the Muslim conquest of Persia.
With a long history of literature in the form of Middle Persian before Islam, Persian was the first language in Muslim civilization 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 ('Book of Kings') of Ferdowsi, works of Rumi, Rubaiyat of Omar Khayyam, Divan ('miscellany') of Hafiz and the two miscellanea of prose and verse by Sa'di of Shiraz, the Golestān (lit., 'flower garden') and the Būstān (also meaning "garden;" lit., 'a place of fragrance').
Persian belongs to the Western branch of the Iranian family of Indo-European languages, which also includes Kurdish, Gilaki, Mazandarani, Talyshi, and Baluchi. The language is in the Southwestern Iranian group, along with the Larestani, Kumzari, and Luri languages.
Persian, the historically more widely used name of the language in English, is an anglicized form derived from Latin *Persianus Latin Persia Greek Περσίς Persís "Persia", a Hellenized form of Old Persian Parsa. According to the Oxford English Dictionary, the term Persian as a language name is first attested in English in the mid-16th century. Native Iranian Persian speakers call it Fārsi. Farsi is the Arabicized form of Pārsi, due to a lack of the 'p' phoneme in Standard Arabic (i.e., the 'p' was replaced with an 'f'). The origin of the name Farsi and the place of origin of the language which is Fars is, of course, the Arabicized form of Pârs. In English, this language has historically been known as "Persian", though "Farsi" has also gained some currency. According to the OED, the term Farsi was first used in English in 1926, while Parsi dates to 1790. "Farsi" is encountered in some linguistic literature as a name for the language, used both by Iranian and by foreign authors.
In South Asia the word "Farsi" refers to the language while "Parsi" describes the people of Persian origin, particularly Zoroastrians.