It's 2019! Everybody thinks they know code splitting. So - let's double check!
What does code splitting stand for?
In short – code splitting is just about not loading a whole thing. Then you are reading this page you don't have to load a whole site. When you are selecting a single row from a database – you don't have to take all.
Obvious? Code splitting is also quite obvious, just not about your data, but your code.