Why is it important to reduce dependencies between modules in a system?

Reducing dependencies between modules is important for:

• Increasing modularity and ease of maintenance — changes in one module do not cause cascading changes in others.
• Improving testability — low-coupling modules are easier to test in isolation.
• Enhancing flexibility and extensibility — modules can be replaced or updated without risking breaking the system.
• Simplifying architecture understanding — loosely coupled modules are easier to analyze and develop.

In C#, interfaces, dependency injection, and design patterns such as Dependency Injection are often used to reduce dependencies.