# Plugins

The **Shopware 6 Plugin System** is a flexible and modular system that allows developers to add functionalities to the Shopware platform or extend existing features. It is based on the Symfony framework and follows modern PHP standards.

### Target systems

Shopware plugins can only be used in a self hosted or PaaS (Cloud) environment. It is not possible to use a plugin in a SaaS (Cloud) environment.

### **Core Features of the Shopware 6 Plugin System**:

1. **Modularity**
   * Plugins can be developed, installed, and updated independently.
   * Extensions do not directly modify the core but instead enhance or modify specific areas.
2. **Two Main Types of Extensions**
   * **Apps**: Platform-independent extensions that interact with Shopware via API without directly modifying the code.
   * **Plugins**: PHP-based extensions that deeply integrate with the system and can modify core functionalities.
3. **Symfony Event System & Hooks**
   * Plugins utilize the **event listener system** to influence existing processes or add custom logic.
   * **Subscribers** can hook into events to extend order processes or modify the frontend.
4. **Dependency Injection (DI)**
   * The plugin system uses Symfony's DI container to manage services efficiently and flexibly.
5. **Database Extensions with Migrations**
   * Plugins can add custom database tables or fields using **migration scripts**.
6. **Theme Customization & Twig Templates**
   * Plugins can modify the frontend by adding custom templates, blocks, or Twig-based enhancements.
7. **Management via the Shopware Admin Panel**
   * Plugins can be easily installed, activated, and configured through the **Admin Panel**.


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