Proto-Indo-European Language (PIE) is the hypothetical common ancestor of the Indo-European languages, which include languages like English, Spanish, and Hindi. Linguists believe it was spoken around 4500 to 2500 BCE in the region near the Black Sea. PIE is not directly recorded but has been reconstructed through comparative linguistics, analyzing similarities among its descendant languages. The study of PIE helps researchers understand how languages evolve and spread over time. By examining shared vocabulary and grammar, linguists can trace the migration of ancient peoples and the development of diverse cultures across Europe and Asia.