Introduction: Welcome to the Component Diagram Tutorial, where we unravel the essence of Component Diagrams in UML. These diagrams serve as a visual storyteller, illustrating the structural relationships between components within a system.

Purpose: The primary goal of a Component Diagram is to showcase the intricate connections among system components. In the realm of UML, components are collections of software objects with a shared purpose. These autonomous entities encapsulate functionality within a system or subsystem, offering interfaces for interaction. Grouping classes into components enhances modularity, allowing for interchangeability and reuse.

Getting Started: Embark on your Component Diagram journey with an online tool like Visual Paradigm Online. Click the “Draw” button to create your Component Diagram effortlessly. Visual Paradigm Online offers a free and intuitive platform, making your exploration seamless.

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  1. Component:
    • Representation: Rectangle with optional compartments.
    • Stereotype Text: “<<component>>.”
    • Stereotype Icon: Rectangle with protruding smaller rectangles.

    UML Component Symbol

  2. Component Interfaces:
    • Provide Interface: Defines public attributes and operations provided by implementing classes.
    • Required Interface: Specifies public attributes and operations required by dependent classes.
    • Provided and Required Interface:

Provided and Required Interface

  1. Component Assemblies: Components connect through a ball-and-socket joint, forming subsystems.

    Component Diagram ball and socket joint

  2. Port: Indicates that a component delegates interfaces to an internal class.

    UML Component Diagram Port

When to Draw a Component Diagram: Utilize Component Diagrams when:

  • Dividing your system into components.
  • Displaying interrelationships through interfaces.
  • Breaking down components into a lower-level structure.

How to Draw a Component Diagram:

  1. Clarify the diagram’s purpose.
  2. Add components, grouping them when necessary.
  3. Include additional elements like classes, objects, and interfaces.
  4. Establish dependencies between diagram elements.

Additional Tips:

  • Draw subsystems for logical categorization.
  • Utilize the diagram to simplify the high-level system view.


  1. Order Processing System:
    • Offers a holistic view of components involved in an online store.

    UML Component Diagram Example: Order Processing System

  2. Ticket Selling System:
    • Highlights components like ticket seller, credit card processor, and database.

    UML Component Diagram Example: Ticket Selling System

  3. Store Component:
    • Demonstrates nested component structure.

    UML Component Diagram Example: Store Component

  4. White-Box View:
    • Explores the internal composition of components.

    UML Component Diagram White Box View

  5. Deployment Diagram Integration:
    • Depicts the physical deployment of software components.

    UML Components in Deployment Diagram


Component Diagrams offer a powerful lens to view systems, providing clarity and modularity. Dive into the world of Component Diagrams, and discover the art of visualizing system architecture.

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Component Diagram Templates

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