The Balts or Baltic peoples (Lithuanian: baltai, Latvian: balti) are an ethno-linguistic group of peoples who speak the Baltic languages of the Balto-Slavic branch of the Indo-European languages. One of the features of Baltic languages is the number of conservative or archaic features retained. Among the Baltic peoples are modern-day Lithuanians and Latvians (including Latgalians) — all Eastern Balts — as well as the Old Prussians, Yotvingians and Galindians — the Western Balts — whose languages and cultures are now extinct.