A system is a group of interacting or interrelated parts that work together according to rules or constraints to form a unified whole.
The word comes from the Greek systēma, "a whole made of several parts." A system is described by its boundaries, its structure, and its purpose, and it shows itself in how it functions within a surrounding environment. Systems theory and the wider systems sciences study the properties that recur across natural, social, and engineered systems, such as structure, function, behavior, and interconnection.
In business, a system is a repeatable arrangement of processes, tools, and data that produces a result without being reinvented each time. A 📝CFO System, for example, is an integrated set of processes and tools that collects business data and turns it into actionable metrics, and a 📝Systems Diagram maps how the software systems of a growing company connect.