Indo European languages together are the most widespread languages and is by far the largest language family in terms of native speakers. Major Indo European language families include Germanic (which includes English, German, Dutch, Swedish, Danish and Norwegian), Slavic (which includes Polish, Bulgarian, Russian, Czech and Serbian), Romance (which includes Spanish, Italian, Portuguese and French) and even includes languages like Persian, Hindi, Irish Gaelic and Scots Gaelic.
Indo European descend from a language we now call Proto Indo European which was spoken around 6000 BC. While there are many theories about where Proto Indo European originated, a major theory states that it emerged in the steppes of Russia.
Indo European languages continue to be very important in the world today thanks to languages like English (which is considered by many to be a near global lingua franca), Spanish (a lingua franca of South America) and French (which is a widely spoken language in Africa).