Definition: Indo-European is the term used to refer to the large group of related languages derived from a single root, called Proto-Indo-European. These languages include all of the Romance languages (for example, French, Spanish, Italian, Portuguese, Catalan, Romanian), Germanic (Icelandic, Danish, German, English, Yiddish), Celtic (Irish, Welsh, Scots), Balto-Slavic (Lithuanian, Latvian), Slavic (Polish, Czech, Serbo-Croatian), other Western (Greek, Albanian), and Eastern Satem languages (Farsi, Afghan, Sanskrit, Hindi, Romany).