A block diagram illustrating the processes that occur to regulate the environment inside a greenhouse. A block diagram is a graphical representation of a system that shows how the system works. Block diagrams help us comprehend the functions of a system and develop links within it. The rectangular pieces that make up a block diagram give the diagram its name. They are used to represent processes as well as to explain hardware and software systems. The function and structure of block diagrams, as well as their relationships with other blocks, are discussed and specified.