Why do we use “the most” as in “Which countries travel the most?”, why not just “Which countries travel most?”

Question

Recently, I discovered that some people use the most in sentences such as Which countries travel the most or we stress the last number the most.

Why not just most?

For example, is it ok to say Which countries travel most or we stress the last number most.

the most sounds very strange to my ears.

Extra info: So what is the difference between:

Which one do you love most?

and

Which one do you love the most?

Answer 1

The correct question is the first one though, cuz in case you want to say, what countries travel most? Then you should use more instead of most. Hence, every time you use most you must add the. The most beautiful thing. She is most beautiful girl on Earth.this one sounds weird cuz I didn't put "the"