The architectural layers
From top to bottom, Magento can be divided into four architectural layers, namely presentation, service, domain, and persistence.
The presentation layer is the one that we directly interact with through the browser. It contains layouts, blocks, templates, and even controllers, which process commands to and from the user interface. Client-side technologies such as jQuery, RequireJS, CSS, and LESS are also a part of this layer. Usually, three types of users interact with this layer, namely web users, system administrators, and those making the Web API calls. Since the Web API calls can be made via HTTP in a manner that is the same as how a user uses a browser, there's a thin line between the two. While web users and Web API ...
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