A "module" is a self-contained unit or component that can be combined with others to create a larger system. In education, a module often refers to a specific segment of a course that focuses on a particular topic, allowing students to learn in manageable sections. Each module typically includes lessons, assignments, and assessments to help gauge understanding. In technology, modules are used in software development to organize code into reusable parts. This modular approach allows developers to work on different sections independently, making it easier to maintain and update software. Examples of modular systems include LEGO sets and computer programming languages like Python.