SOLID is a set of five design principles intended to make software designs more understandable, flexible, and maintainable. The principles are: Single Responsibility Principle (a class should have only one reason to change), Open/Closed Principle (software entities should be open for extension, but closed for modification), Liskov Substitution Principle (subtypes must be substitutable for their base types), Interface Segregation Principle (clients should not be forced to depend on methods they don't use), and Dependency Inversion Principle (high-level modules should not depend on low-level modules; both should depend on abstractions).
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