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In Angular, a **modular structure** is the organization of an application as **separate, logically related blocks (modules)**, each of which manages its own set of components, directives, pipes, and services.

## Key points

1. `NgModule` - the basic building block of the modular structure.

- Defined using the `@NgModule` decorator.
- Contains:
  - `declarations` - components, directives, and pipes that belong to the module.
  - `imports` - other modules required for the current module to work.
  - `providers` - services available through DI.
  - `exports` - elements that can be used in other modules.

2. **Root module (**`AppModule`**)**

- The application's starting point.
- Imports all the required feature modules.

3. **Feature modules**

- Split the application into logical parts: `UserModule`, `AdminModule`, `SharedModule`, and so on.
- Provide reusability, readability, and maintainability of the code.

4. **Advantages of a modular structure**

- Improves code organization and project maintenance.
- Allows lazy loading of modules (`Lazy Loading`) to optimize performance.
- Makes testing and scaling the application easier.

In other words, a modular structure is a **logical segmentation of the application into independent blocks**, each of which encapsulates its own functionality and dependencies.

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