Model vs ResourceModel vs Collection in Magento

Magento’s data layer is extremely complex, so it’s a good time to try to simplify the responsibility of each of these layers.

The data layer starts with models. A model is simple PHP class that represents a data entity. This can be something like a blog post, an email, a product, or something else entirely. So, I may have a Post model to represent a specific blog post. Models can be linked to a database, which is a type of resource. Models do not necessarily need to be connected to a database, but when they are, that's where ResourceModels come into play.

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