It works when using multiple languages that share the same writing system (the Latin alphabet). It means that you have a single keyboard, but the words that swi

It works when using multiple languages that share the same writing system (the Latin alphabet). It means that you have a single keyboard, but the words that swipe or auto complete are from more than one language; generally the predictive nature means that when you switch languages it's pretty good at predicting future words are from the same language. It also means things like you get all the diacritics from all of the languages when you long press. I was studying French, while also working with several Polish people, so I set my keyboard to simultaneously English, French, and Polish, and then I was able to do French lessons without switching, and also able to write my Polish coworkers names easily.