Abstract is: Albanian (endonym: shqipja [ʃcipja] or gjuha shqipe [ˈɟuha ˈʃcipe]) is an Indo-European language and an independent branch of that family of languages. It is spoken by the Albanians in the Balkans and by the Albanian diaspora, which is generally concentrated in the Americas, Europe and Oceania. With about 7.5 million speakers, it comprises an independent branch within the Indo-European languages and is not closely related to any other modern Indo-European language. Albanian was first attested in the 15th century and it is a descendant of one of the Paleo-Balkan languages of antiquity. For historical and geographical reasons, some modern historians and linguists believe that the Albanian language may have descended from a southern Illyrian dialect spoken in much the same region in classical times. Alternative hypotheses hold that Albanian may have descended from Thracian or Daco-Moesian, other ancient languages spoken farther east than Illyrian.Too little is known of these languages to completely prove or disprove the various hypotheses. The two main Albanian dialect groups (or varieties), Gheg and Tosk, are primarily distinguished by phonological differences and are mutually intelligible in their standard varieties, with Gheg spoken to the north and Tosk spoken to the south of the Shkumbin river. Their characteristics in the treatment of both native words and loanwords provide evidence that the split into the northern and the southern dialects occurred after Christianisation of the region (4th century AD), and most likely not later than the 5th–6th centuries AD, hence possibly occupying roughly their present area divided by the Shkumbin river since the Post-Roman and Pre-Slavic period, straddling the Jireček Line. Centuries-old communities speaking Albanian dialects can be found scattered in Greece (the Arvanites and some communities in Epirus, Western Macedonia and Western Thrace), Croatia (the Arbanasi), Italy (the Arbëreshë) as well as in Romania, Turkey and Ukraine. Two varieties of the Tosk dialect, Arvanitika in Greece and Arbëresh in southern Italy, have preserved archaic elements of the language. Ethnic Albanians constitute a large diaspora, with many having long assimilated in different cultures and communities. Consequently, Albanian-speakers do not correspond to the total ethnic Albanian population, as many ethnic Albanians may identify as Albanian but are unable to speak the language. Standard Albanian is a standardised form of spoken Albanian based on Tosk. It is the official language of Albania and Kosovo, a co-official language in North Macedonia and Montenegro, as well as a minority language of Italy, Croatia, Romania and Serbia.