The acronym SOLID in the context of software design stands for “Single Responsibility Principle, Open-Closed Principle, Liskov Substitution Principle, Interface Segregation Principle, and Dependency Inversion Principle. All these are important software design principles used by .NET software architects in their line of work.
The Single Responsibility Principle (SRP) requires a class or module to have one reason to change and have a single responsibility. The Open-Closed Principle says that software entities or components should be open to extension and closed for modification. Liskov Substitution Principle states that subtypes must be substitutable for their base types while not affecting the program’s correctness.
The Interface Segregation Principle states that clients should never be forced to depend on interfaces they don’t use. The interfaces should be cohesive and focused. Lastly, the Dependency Inversion Principle states that high-level modules must never depend on lower-level modules. Ideally, both low-level and high-level modules should only depend on abstractions.