SOLID

SOLID is an acronym that stands for five principles of object-oriented software development, which were first introduced by Robert C. Martin in the early 2000s. These principles are:

• Single Responsibility Principle (SRP)
• Open/Closed Principle (OCP)
• Liskov Substitution Principle (LSP)
• Interface Segregation Principle (ISP)
• Dependency Inversion Principle (DIP)

Learn more from the following resources:

• Get Started with SOLID
• SOLID Principles
• Tutorial - What are SOLID principle?