What is the Open Systems Interoperability Reference Model?

Question

IT education

Actually, it is necessary to answer the question, what is the “Reference model of open systems interaction”?
Can you give a small, but more complete, comprehensive answer, for a non-specialist?

Answer 1

This is how Russian-speaking teachers who have never worked in the field of information technology, but only teach everyone from books, call the OSI model.
https://ru.wikipedia.org/wiki/%D0%A1%D0%B5%D1%82%D...

Answer 2

This is a model of interaction between public information (computer, it) systems, any. It is not used anywhere and is not needed by anyone. It is given to students for a simplified abstract understanding of the operation of any protocol (ip, dns, http). A sort of general protocol formula.