What are Component Diagrams?

Component diagrams are used to represent how the physical components in a system have been organized. We use them for modeling implementation details.

• Component Diagrams depict the structural relationship between software system elements and help us understand if functional requirements have been covered by planned development. 
• Component Diagrams become essential to use when we design and build complex systems. 
• Interfaces are used by components of the system to communicate with each other

Two important types of diagrams used in this process of designing software systems are Composite Structure Diagrams and Component Diagrams. They are the types of Structural Diagrams. While they both help visualize how different parts of a system work together, they focus on different aspects of the system.