The Indo-European Languages:

The Indo-European languages are a family of several hundred related languages and dialects. The most widely spoken Indo-European languages by native speakers are Spanish, English, Hindi, Portuguese, Bengali, Russian, Persian and Punjabi, each with over 100 million speakers. Today, 46% of the human population speaks an Indo European language, by far the most of any language family, 

The Indo-European family includes most of the modern languages of Europe, and parts of Western, Central and South Asia. It was also predominant in ancient Anatolia (present-day Turkey), and the ancient Tarim Basin (present-day Northwest China) and most of Central Asia until the medieval Turkic migrations and Mongol invasions. With written evidence appearing since the Bronze Age in the form of the Anatolian languages and Mycenaean Greek, the Indo-European family is significant to the field of historical linguistics as possessing the second-longest recorded history, after the Afroasiatic family