Why are SOLID principles needed?

The SOLID principles are essential for creating flexible, maintainable, and scalable software architecture. They help to:

• Reduce coupling between components.
• Facilitate testing and maintenance of code.
• Increase reusability and readability.

In brief:

• Single Responsibility Principle (SRP): a class should have one responsibility.
• Open/Closed Principle (OCP): entities should be open for extension but closed for modification.
• Liskov Substitution Principle (LSP): subclasses should be interchangeable with their base classes.
• Interface Segregation Principle (ISP): it's better to have many specialized interfaces than one universal interface.
• Dependency Inversion Principle (DIP): dependencies should be based on abstractions, not on concrete implementations.

This reduces technical debt and improves code quality.