Can you list and explain the main SOLID principles applied in object design?

SOLID is a set of five principles of object-oriented design that help create flexible and maintainable systems:

1. Single Responsibility Principle (SRP) — a class should have one and only one reason to change.
2. Open/Closed Principle (OCP) — software entities should be open for extension but closed for modification.
3. Liskov Substitution Principle (LSP) — objects of a subclass should be replaceable with objects of the superclass without affecting the correctness of the program.
4. Interface Segregation Principle (ISP) — many specific interfaces are better than one general interface.
5. Dependency Inversion Principle (DIP) — high-level modules should not depend on low-level modules; both should depend on abstractions.

Applying these principles helps reduce coupling and increase reusability of code.