SOLID Principles

In object oriented programming, SOLID is for five design principles inented to make software designs more understandable, flexible and maintainable.

Single Responsibility Principle:

A class should have a single responsibility, that is, only changes to one part of the software's specification should be able to affect the specification of the class

Open-closed principle:

Sotware entities should be open for extension, but closed for modification

Liskov Subsitution principle:

Objects in a program should be replaceable with instances of their subtypes without altering the correctness of that program.

Interface segregation principle:

Many client-specific interfaces are better than one general-purpose interface.

Dependency Inversion principle:

One should depend upon abstractions, not concretions.