What is the difference between cohesion and coupling in software architecture?

Understanding Cohesion and Coupling in Software Architecture

In software architecture, cohesion and coupling are two important concepts that play a crucial role in the design and development of software systems. Understanding the difference between cohesion and coupling is vital for creating well-structured and maintainable software applications.

Cohesion

Cohesion refers to the degree to which the elements within a module or component of a software system are related to each other. High cohesion indicates that the elements within a module are closely related and focused on performing a specific task or functionality. This leads to a more modular and understandable design, making the code easier to maintain and update.

Coupling

Coupling, on the other hand, refers to the degree of dependency between different modules or components within a software system. Low coupling means that the modules are independent of each other and can be modified or replaced without affecting other parts of the system. High coupling can lead to a complex and rigid system that is difficult to maintain and scale.

Difference between Cohesion and Coupling

The key difference between cohesion and coupling is that cohesion focuses on the internal relationship and organization of elements within a module, while coupling focuses on the external dependencies and interactions between different modules. Striking a balance between high cohesion and low coupling is essential for creating a robust and flexible software architecture.

By understanding and applying the principles of cohesion and coupling in software architecture, developers can create more modular, maintainable, and scalable software systems that are easier to extend and adapt to changing requirements.