Because you never know when you and another person will need to converse in two different languages, there’s Google Translate. And don’t forget that the louder you speak in a language people don’t know, the better they’ll be able to understand you. That’s how language works!
It’s as close as we’ve come to a true on-the-fly translation machine. Google Translate allows you to speak English into your phone and have Spanish come out the other end, and vice versa. There are other supported languages too.