A block diagram is a visual representation of a system that utilizes simple, labeled cubes which represent single or multiple items, concepts or entities, connected by lines to show relationships between them. An entity relationship diagram (ERD), one instance of a block diagram, represents an advice system by demonstrating the relationships between individuals, objects, places, concepts or events inside that system. (See an image in the ERD definition webpage.)
Block diagrams are a generalized representation of a theory and are not intended to display complete information in regards to design or manufacture. Unlike schematics, blueprints and layout diagrams, block diagrams don't portray the necessary detail for physical construction. Block diagrams are created easy in order not to cloud concepts.
The simplification in block diagrams can also be useful when demonstrating an idea, but concealing the internal workings of potentially key intellectual property (IP). Top-down design in electrical technology often progresses through increasingly detailed block diagrams. Once enough detail is inserted through iterations, the block structure becomes a schematic. Block diagrams in procedure control show the purposes of operations but not the components that perform them. The functions of block diagrams can then be executed with programmable logic controls (PLC).
Block diagrams are utilized heavily in engineering and design of diagrams for hardware, electronic equipment, applications and procedures. Most commonly, they symbolize theories and systems at a greater level, less detailed summary. The diagrams are useful for troubleshooting technical problems.
Block diagrams are also utilised in a scientific context. In the study of biology, for instance, block diagrams have been used to show biological functions and interrelations.