Modules

Modules, packages, libraries, namespaces, all of these terms refer to the concept of grouping code. Most programming languages have such a mechanism, but for many frameworks this is not enough. They provide higher-level abstractions that their users can hook into, to group and share functionality.

• Often closely coupled to the frameworks DI container

Implementations

• Symfony --- Flex & Bundles https://symfony.com/doc/current/bundles.html
• Laravel --- extra.laravel key in composer.json https://laravel.com/docs/packages
• Spring --- annotations @Enable* https://www.baeldung.com/spring-enable-annotations
• Rails --- Plugins: https://guides.rubyonrails.org/plugins.html
• Django --- Apps: https://docs.djangoproject.com/en/4.2/intro/reusable-apps/