Core concepts of Magenot 2 - Part 4

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Modules: Magento 2 uses a modular architecture, with each feature of the platform being implemented as a separate module. This allows for easy customization and extension of the platform, as well as reducing the size of the core codebase.
Dependency Injection: Magento 2 uses dependency injection to manage the relationships between different objects and classes in the platform. This helps to ensure that the platform is flexible and easy to maintain, and makes it easier to replace or extend existing functionality.
Service Contracts: Magento 2 uses service contracts to define the interfaces that different components of the platform use to communicate with each other. This helps to ensure that the platform is flexible and easy to maintain, and makes it easier to extend existing functionality.
Plugins: Magento 2 uses plugins, also known as interceptors, to modify the behavior of existing classes without having to change the underlying code. This allows for easy customization and extension of the platform, without having to modify core code.
The Layout System: Magento 2 uses a layout system to control the way that pages are constructed and displayed. This system allows for easy customization of the appearance and layout of the platform, and helps to ensure that pages are rendered efficiently.
Templates: Magento 2 uses templates to control the way that pages are rendered, and to define the structure of the HTML that is generated. Templates can be customized and extended to match the needs of a specific website or application.
Theme and Skin Components: Magento 2 uses a combination of themes and skin components to control the look and feel of the platform. Themes control the layout of pages, while skin components control the visual appearance of the platform, such as colors and fonts.
The Event System: Magento 2 uses an event system to allow different parts of the platform to interact and respond to changes. This allows for easy customization and extension of the platform, and makes it easier to build complex, dynamic applications.
By understanding these core concepts, developers and architects can build and maintain robust, scalable, and flexible e-commerce applications using Magento 2.

[@RoamwithRD]

Factories are not a singleton, both are different.
Factories create new instances but singleton does not create new instances