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What does "SOLID" mean in programming?
SOLID is one of the most common terms in software development. This guide explains what it means, how it is used in practice, and why it matters, with real examples from the developer world.
Definition
An acronym for five object-oriented design principles: Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, and Dependency Inversion. Following SOLID leads to code that is flexible, maintainable, and easy to test.
Example
"After the SOLID refactor, each class has one job and depends on interfaces — swapping implementations requires no changes upstream."
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