If you know multiple languages and know other people who speak those languages, it’s smart to have the keyboard for that language. It’s good to have the keyboard if it uses a different alphabet, or has shortcuts for accents and other special characters. So here’s how to add a new keyboard.
How to Add a New Keyboard

1) Launch Settings.

2) Tap General.

3) Tap Keyboards.

4) Tap Keyboards again.

5) Tap Add New Keyboard.

6) Choose a new keyboard, then enjoy using the new keyboard!