Block diagrams are a generalized representation of a concept and are not intended to display full information in relation to manufacture or design. Unlike schematics, blueprints and layout diagrams, block diagrams do not portray the essential detail for physical structure. Block diagrams are created simple in order not to cloud concepts.
The simplification in block diagrams can also be helpful when demonstrating a notion, but hiding the inner workings of potentially confidential intellectual property (IP). Top-down design in electrical engineering frequently progresses through progressively detailed block diagrams. Block diagrams in process control show the functions of operations but not the components that execute them. The functions of block diagrams can then be executed with programmable logic controls (PLC).
Block diagrams are used heavily in engineering and design of diagrams for electronics, hardware, applications and procedures. Most frequently, they represent concepts and systems at a greater level, less detailed summary. The diagrams are useful for troubleshooting technical problems.
An entity relationship diagram (ERD), one instance of a block structure, represents an information system by showing the relationships between people, objects, locations, events or theories within that system. (See an image in the ERD definition site.)
Block diagrams can also be utilized in a context. In the study of math, by way of example, block diagrams have been used to exhibit biological functions and interrelations.