The Indo-European languages are, in the classical model, supposed to have spread into India, the Middle East and Europe from parts of Central Asia producing many of the modern languages in those areas. It is nevertheless difficult to find evidence. Historians many decades ago guessed that the language reached Europe via Neolithic farming from Anatolia and recent DNA supports that European farmers came from there. But did the language?
In fact, is there actually such a mother-language from which so many others originate or just similarities between neighbours?