midOOP
What are SOLID principles?
Updated May 17, 2026
Short answer
SOLID is a set of five design principles for maintainable OOP systems.
Deep explanation
It includes SRP, OCP, LSP, ISP, DIP to improve scalability and maintainability.
Real-world example
Enterprise systems structured into modular services.
Common mistakes
- Trying to force all principles in small projects.
Follow-up questions
- What does SRP mean?
- Why are SOLID principles important?