The concept of systems is really quite simple. The basic idea is that a system has parts that fit together to make a whole; but where it gets complicated and interesting $-$ is how those parts are connected or related to each other. There are many kinds of systems: government systems, health systems, military systems, business systems, and educational systems, to name a few.

References:

Frick, T$.(1991).$ Restructuring education through technology. Bloomington, IN:

Phi Delta Kappa Educational Foundation.

Systems, including both business systems, and educational systems, are actually very simple. The main idea is that systems have parts that fit together to make a whole. What is interesting is how those parts are connected together.