For a period of time, people thought that they need a global language. And the solution was an artificial language: Esperanto. Althrough, it didn't become a global language. Instead of it , English has spread across the world. You need this language because 80% of the computer's data is stored in English, you need it for your holidays, for entertainment. However, English is not welcomed everywhere, An example would be Academie Francaise. It banned words like Walkman because they want people to use French words instead
