What does the word layout mean from the mouth of a “css\html programmer”?

Question

css

Realizing that I can get an answer from one or a few words, I decided to explain the essence of the issue in more detail.
Imagine that a very experienced programmer asked you to prove to him (who already knows one hundred percent) that you understand what layout is in modern design. What would you tell him?

Answer 1

Hold a gun to his temple and say:
layout is a layer between the user and the server, like a layer of sweat between the muzzle and the temple

Answer 2

In my view, layout is a static part of the site. Those. a template inside which something is already dynamic or changing.