What is the primary function of a block diagram?

The primary function of a block diagram is to show how parts of a system relate to one another. It provides a high-level overview of a system by using blocks to represent different components and lines to illustrate their interconnections. This type of diagram emphasizes the relationships and interactions between various parts, rather than getting into the detailed specifics of each component.

While options that mention the flow of a process or electrical current flow may also have some relevance in specific contexts, a block diagram is not primarily focused on those elements. It does not typically represent electrical components in detail, nor does it delve into the specifics of how processes flow step by step. Instead, it serves as a simplified representation that facilitates understanding of how various parts work together within a system. This makes it especially useful for analysis and communication among stakeholders who need to grasp the overall structure without getting bogged down in finer details.