Using product collections can be very beneficial to Magento developers. In order to understand Magento Product Collections, you should have an understanding of what a Collection is, in addition to having an understanding of Magento Models.
In short, a Magento Model is similar to an object in the sense that it contains both data and methods. A Magento Collection is a Model type that contains other models. So when we use the terminology “product collection”, we’re basically talking about all of the products in any given situation.
To retrieve all the products of a particular category, we simply open the category Model and load the product collection of that category. It looks something like this: