Lingua Franca
A language used to make communication possible between individuals or groups who do not share a mother tongue or common language. Traditionally established to facilitate trade, the use of lingua franca has also become common in diplomacy and as a means of information exchange between individuals of different nationalities. Lingua francas are similar to international auxiliary languages, languages used for communication between people without a common native tongue. The most well-known constructed international auxiliary language is esperanto, which was designed to transcend nationality and allow better understanding between people from different cultures.
