Block diagrams are utilized in design and engineering of diagrams for software, hardware, electronic equipment and processes. Most frequently, they represent theories and systems in a higher level, less thorough summary. The diagrams are helpful for troubleshooting technical issues.
A block diagram is a visual representation of a system that uses simple, labeled cubes that represent single or multiple objects, entities or concepts, connected by lines to show relationships between them. An entity relationship diagram (ERD), one case of a block diagram, represents an info system by showing the relationships between people, objects, locations, concepts or events inside this system. (See an image on the ERD definition site.)
The simplification in block diagrams may also be useful when demonstrating a notion, but hiding the inner workings of possibly secret intellectual property (IP). Top-down design in electrical engineering frequently progresses through increasingly detailed block diagrams. Once a detail is inserted through iterations, the block structure becomes a schematic. Block diagrams in procedure control reveal the purposes of surgeries but not the elements that perform them. The functions of block diagrams may then be implemented with programmable logic controls (PLC).
Block diagrams are a generalized representation of a theory and are not meant to display full information in relation to design or manufacture. Contrary to schematics, blueprints and design diagrams, block diagrams do not portray the essential detail for bodily structure. Block diagrams are made simple so as to not cloud concepts.
Block diagrams can also be utilized in a scientific context. In the study of math, for instance, block diagrams can be used to exhibit biological functions and interrelations.