Could you explain what the SOLID acronym means in the context of object-oriented programming?

SOLID is a set of five principles of object-oriented programming that help create flexible, extendable, and maintainable code:

• S (Single Responsibility Principle) — A class should have only one reason to change.
• O (Open/Closed Principle) — Software entities should be open for extension but closed for modification.
• L (Liskov Substitution Principle) — Subtypes must be substitutable for their base types.
• I (Interface Segregation Principle) — Clients should not be forced to depend on interfaces they do not use.
• D (Dependency Inversion Principle) — High-level modules should not depend on low-level modules; both should depend on abstractions.

These principles help write code that is easier to test, extend, and maintain.