SOLID Principles Explained: Five Rules for Cleaner, Scalable Software Design

SOLID is a set of five software design principles aimed at improving code quality, scalability, and maintainability. The Single Responsibility Principle states that each class should have only one reason to change, avoiding so-called 'God Classes' that handle multiple concerns at once. The Open/Closed Principle advises that code should be open for extension but closed for modification, reducing reliance on conditional logic when adding new features. The Liskov Substitution Principle requires that child classes can replace parent classes without breaking the application, encouraging more careful inheritance planning. The Interface Segregation Principle holds that no class should be forced to depend on methods it does not need, favoring smaller, purpose-specific interfaces over large, all-encompassing ones.