What are SOLID principles

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Accepted Answer

SOLID principles are a set of five design principles for writing maintainable and scalable code.

S - Single Responsibility Principle: A class should have only one reason to change.
O - Open/Closed Principle: A class should be open for extension but closed for modification.
L - Liskov Substitution Principle: Subtypes should 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.