The Indo-European language is thought to have originated out of?

The Indo-European language is thought to have originated out of the Proto-Indo-European language. This language is a hypothetical reconstructed language that is believed to have been spoken in the Pontic-Caspian Steppe, a vast grassland region north of the Black Sea, around 4500 to 2500 BCE.

While we don't have any written records of Proto-Indo-European, linguists have reconstructed it by comparing the similarities and differences between the various Indo-European languages spoken today.

It's important to note that this is a scientific theory based on linguistic evidence. The exact origin and spread of the Indo-European language are still debated among scholars.