A language becomes a lingua franca when it's widely used as a second language, meaning people learn it in addition to their native language. This happens when a language is politically or economically powerful, like English, or when it's geographically strategic, like Arabic in the Middle East. As a result, people from different countries and cultures start using it to communicate with each other.
One quirky fact about lingua francas is that they can change over time. For example, French was once the global lingua franca, but it was later replaced by English. This shift happened due to the rise of the United States as a global superpower and the growing importance of international trade and technology.
