This theory was created to describe the structure and behavior of a system. Systems theory covers all specific types of systems, from technical (physical) systems to conceptual (abstract) systems, increasing their level of generalization and functioning.
What is a system?
We call the system "the sum total of parts that function independently but jointly to achieve required products or results, based on the needs". "Kaufman"
According to the dictionary of the real Spanish academy, system is the set of rules or principles on a matter rationally linked to each other, or the set of things that orderly related to each other contribute to a given object.