Block Diagrams is a diagrammatic view of the system where its subsystems or components are shown as blocks. Linkages between the blocks depict relationships between the subsystems and/or components.
An application-oriented question on the topic along with responses can be seen below. The best answer was provided by Sourabh Nandi on 25th Sep 2020
Applause for all the respondents - Aritra Das Gupta, Sourabh Nandi, Sudheer Chauhan