It depends. Where I have worked interns have done real work like a grad. I also interned. I didnt even know the word intern! To me it was a summer job where I wrote code.
The main difference intern vs grad is tbey know you'll leave soon for uni so it tends to be not too deep. The project will be something quick go get started on and probably not the main gnarly monorepo.
But yeah internship can also mean making tea... metaphorically.