SOLID is an acronym that represents the five underlying principles that guide a good software design. The design is related to the creation of components that shape your software architecture.

In 2004, Michael Feathers suggested this acronym to Robert C. Martin, the author of these principles. The process for creating them took him around 20 years, and during this period, many of them were added, removed, and merged to achieve a robust set of principles named SOLID. Let's review each one of the principles and provide a brief and clear explanation that will be helpful for getting a precise idea of how we can use them.

We will use the term module in tandem with the idea of modules shaping components, and we will make reference to the object-oriented programming (OOP) world using terms such as classes and interfaces in order to provide a more precise explanation of modules.