One thing that differentiate human from all other species of the world is the way we communicate idea through different languages. For every community or society, language is one of their basic cultural traits that differentiates them from the other groups.
All around the world, there are over 6900 languages that are spoken. But from the 7 billion population of human, almost 3 million people have been found to commonly speak only 10 languages among the thousands that are there.
Mandarin is actually the topmost language since it have more native speakers than any other language on this earth with over 1.3 Billion people preferring it as their lingua franca.