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Can you list the top facts and stats about Lingua franca?
Summarize this article for a 10 year old
A lingua franca (/ /; lit. 'Frankish tongue'; for plurals see § Usage notes), also known as a bridge language, common language, trade language, auxiliary language, vehicular language, or link language, is a language systematically used to make communication possible between groups of people who do not share a native language or dialect, particularly when it is a third language that is distinct from both of the speakers' native languages.
Lingua francas have developed around the world throughout human history, sometimes for commercial reasons (so-called "trade languages" facilitated trade), but also for cultural, religious, diplomatic and administrative convenience, and as a means of exchanging information between scientists and other scholars of different nationalities. The term is taken from the medieval Mediterranean Lingua Franca, a Romance-based pidgin language used especially by traders in the Mediterranean Basin from the 11th to the 19th centuries. A world language—a language spoken internationally and by many people—is a language that may function as a global lingua franca. 
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