As this infographic explains, "There are at least 7,102 known languages alive in the world today. Twenty-three of these languages are a mother tongue for more than 50 milion people. The 23 languages make up the native tongue of 4.1 billion people. We represent each language within black borders and then provide the number of native speakers (in millions) by country. The colour of those countries shows how languages have taken root in many different regions."
You can see the full-sized image here.