What SOLID Principles Actually Solve in Software Design

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SOLID is a set of five software design principles aimed at keeping codebases maintainable as they grow in complexity. Many developers can name the principles but struggle to explain their original purpose, often treating them as a checklist rather than a design philosophy. The principles address common problems such as oversized classes, tight coupling, and fragile code that emerges when systems scale — for example, when a food delivery app expands to support multiple payment gateways, delivery partners, and notification channels. Each principle targets a specific design concern: separating responsibilities, enabling extension without modification, ensuring reliable inheritance, reducing bloated interfaces, and decoupling high-level logic from implementation details. Together, SOLID principles guide how individual classes are structured and connected, but they are not intended to solve every architectural challenge in software design.

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