In the fields of systems engineering and software engineering, a block diagram known as a functional block diagram is used. It defines how a system works and how its parts relate. Since the late 1950s, functional block diagrams have been used in numerous fields, from systems engineering to software engineering. To understand thoroughly from exterior design the operation of the present system and the relationship of each part to the whole, they became necessary in designing complex systems. Many distinct varieties of functional block diagrams have developed. The functional flow block diagram, for instance, is a hybrid of the two types of diagrams. Functioning block diagrams are a foundational technique in many SDKs.
