On my Mac it's under Settings -> Keyboard -> Input Sources. Add a new input source for Select Chinese (Simplified) and take a look at the alternatives:
- Stroke, which uses only symbol characters and numbers to "write" words. Good luck with that!
- Trackpad handwriting. You "write" the characters on your trackpad and it recognizes them. Works pretty well if you already know how to write the characters. But it's much, much slower in my opinion. Plus, you need to memorize how to write thousands of characters and how the characters connect to how the words sound, which there is no systematic mapping for.
- Wubi Xing, which I'm unfamiliar with but seems radical based. Just look at the keyboard - https://en.wikipedia.org/wiki/Wubi_method
- Pinyin, which uses your regular English keyboard. With a little training, you can sound out Chinese words and immediately type them with autocorrect-like functionality that works amazingly well. I can type Chinese almost as fast as English this way.
In short, Pinyin has made it possible for Chinese people to operate efficiently in the modern world we live in.