I'm currently learning about the OSI model, trying to understand exactly what it is and what is the purpose behind it.
The Wikipedia page says:
The Open Systems Interconnection model (OSI model) is a conceptual model that characterises and standardises the communication functions of a telecommunication or computing system without regard to its underlying internal structure and technology. Its goal is the interoperability of diverse communication systems with standard communication protocols.
I fail to understand the intent of the sentence "its goal is the interoperability of diverse communication systems with standard communication protocols".
Was the OSI model developed as a guideline for someone who comes to design a new communication system? Is it just a description of existing systems?
Please clarify this for me.