introduction ve introductory arasındaki fark nedir?Sadece örnek cümleler vermekten çekinmeyin.

You are right, of course. : )

There is something missing if "Introductory" is used without a noun or noun phrase.

This kind of English would be known as "elliptical", where words are deliberately missing.

In your example, it can be assumed we know it's an "Introductory passage" or "Introductory chapter".

So they use an elliptical term "Introductory".

This kind of English sounds rather grandiose or pretentious (to me) because Introduction would be perfectly good. : )