What is a module?
A module is a self-contained unit of software that encapsulates a set of related functions, classes, or procedures. Modules group related functionality together and are used to organize source code and to promote reusability and maintainability.
They can be considered building blocks combined to create larger programs. In different programming languages and environments, modules may be called by different names, packages, libraries, or namespaces. Modules can vary in size and complexity, from small functions to large, complex libraries that provide extensive functionality.