Let’s break it down. SOLID is a set of five software design principles meant to keep your code easy to understand, easy to change, and less fragile as it grows. They’re especially popular in object-oriented programming, but the ideas carry over pretty well to other styles too.

Here’s what each one means in plain terms:

Single Responsibility Principle

A class or module should have one job and one reason to change. When something tries to do too many things, it becomes a mess to maintain.

Open/Closed Principle

Your code should be open for extension but closed for modification. In practice, you want to add new behavior without hacking apart existing, stable code. Inheritance, composition, and interfaces often help here.

Liskov Substitution Principle

If you have a parent type and a child type, the child should be usable anywhere the parent is expected without surprising anyone. If a subclass breaks basic expectations, it’s not a real subtype.

Interface Segregation Principle

Don’t force a class to implement methods it doesn’t need. Smaller, focused interfaces keep things cleaner and more flexible.

Dependency Inversion Principle

High-level code shouldn’t depend on low-level details. Both should rely on abstractions. This makes swapping implementations painless and keeps your architecture from becoming rigid.

What this really means is that SOLID helps your code stay flexible as requirements shift. You spend less time rewriting and more time building the right thing.

SOLID Principles???