# SOLID

SOLID is a set of principles applied to object-oriented design (OOD) to create maintainable, understandable, and flexible code, while avoiding code smells and defects. The principles are:

- Single Responsibility
- Open/Closed
- Liskov Substitution
- Interface Segregation
- Dependency Inversion

<ResourceGroupTitle>Free Content</ResourceGroupTitle>
<BadgeLink colorScheme='blue' badgeText='Original Paper' href='https://web.archive.org/web/20150906155800/http://www.objectmentor.com/resources/articles/Principles_and_Patterns.pdf'>Design Principles and
Design Patterns</BadgeLink>
<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.baeldung.com/solid-principles'>SOLID Principles</BadgeLink>
<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.digitalocean.com/community/conceptual_articles/s-o-l-i-d-the-first-five-principles-of-object-oriented-design'>SOLID: The First 5 Principles of Object Oriented Design</BadgeLink>
