A primitive is a pre-built shape which can be used for modelling. Primitives are made to save time and they can all be edited and changed from their original form by adding sub-divisions and changing each individual section. Sub-divisions can be used to make a model more detailed and complex as you can change sole sections of a specific model/object, this can be used to create facial features such as: ears, noses, eyes, mouths, etc. as you can change the depth and the how much the sections extrude.
In my example in the images to the right, I started by creating a simple cube and then extruding random sections/sub-divisions of it, by doing this, I created an unspeakable atrocity of which I cannot even describe. Because I wasn't very experienced with sub-divisions and this was my first time experimenting with them, all I did was mess around with each one and extruding them to random heights in order to make the weirdest looking object I could. I didn't really add any other objects, the main reason being because I didn't really get around to doing it. After extruding every section of my cube, I began to extrude separate sections of those extrusions.
Box modelling is using a primitive to create the basic shape of your final model. The shape would then be sculpted to create what you want the model to be.
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