Angular applications are modular. By grouping related functionality into NgModules, you create a maintainable and scalable codebase.
1The Anatomy of a Module
An NgModule is defined by a class decorated with @NgModule. This decorator provides metadata that tells Angular how to compile the module's template and how to create an injector at runtime. It consists of four main properties: declarations (components that belong to the module), imports (other modules whose exported classes are needed), exports (classes that should be visible to other modules), and providers (services that the module contributes to the global collection).
2Logical Boundaries
The primary purpose of modularization is to create clear boundaries. A 'Feature Module' might encapsulate all logic related to 'Users' or 'Billing'. By isolating these features, you make the application easier to understand for a team. Furthermore, modularization is the prerequisite for 'Lazy Loading', where Angular only downloads the code for a specific feature when the user actually navigates to it, significantly improving initial load times.
