A block diagram is a visual representation of a system which uses easy, labeled blocks which represent single or several objects, concepts or entities, connected by lines to show relationships between them. An entity relationship diagram (ERD), one instance of a block diagram, represents an info system by showing the relationships between individuals, objects, places, events or theories within this system. (See an image in the ERD definition site.)
Block diagrams are used heavily in engineering and design of diagrams for processes, hardware, software and electronic equipment. Most commonly, they symbolize concepts and systems in a greater level, less detailed summary. The diagrams are helpful for troubleshooting technical difficulties.
The simplification in block diagrams can also be helpful when demonstrating a notion, but hiding the internal workings of potentially key intellectual property (IP). Top-down layout in electrical engineering often progresses through progressively detailed block diagrams. Block diagrams in procedure control reveal the purposes of operations but not the elements that execute them. The functions of block diagrams can then be executed using programmable logic controls (PLC).
Block diagrams are utilized in a context. In the analysis of biology, for example, block diagrams are utilised to exhibit biological functions and interrelations.
Contrary to schematics, blueprints and design diagrams, block diagrams do not portray the necessary detail for physical structure. Block diagrams are made simple so as to not cloud theories.