What is commonly used to display how different parts of a system work together?

A block diagram is commonly used to display how different parts of a system work together because it provides a high-level overview of the system architecture without delving into the technical complexities of the components. Block diagrams depict the main components or subsystems as blocks, connected by lines that illustrate the relationships and interactions between them. This visual representation makes it easier to understand how different elements contribute to the overall functionality of the system.

In contrast, flow charts typically focus on the sequence of operations or decision points within a process rather than on the relationships between major components. Schematic diagrams provide detailed information about the components and their interconnections, often used in electrical engineering to represent the actual wiring and connections, which can be too intricate for a simple overview. Line diagrams, while useful for showing connections or layouts, may not encapsulate the functional relationships as clearly as a block diagram. Therefore, the block diagram is the most effective choice for illustrating how different parts of a system work together.