Define System Context Diagram (SCD)?

Define System Context Diagram (SCD)?

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A System Context Diagram(SCD) in software engineering and systems engineering is a diagram that defines the boundary between the system or part of a system, and its environment, showing the entities that interact with it. This diagram is a high-level view of a system. It is similar to a block diagram.

In other words, the context diagram shows the system under consideration as a single high-level process and then demonstrates the relationship that the system has with other external entities (systems, organizational groups, external data stores, etc).