Many of the low-level technicalities of our life go on right under our nose without us really understanding their inner workings. You drive your car everyday, but do you understand how an internal combustion engine
works? You keep your milk cold in the fridge, but do you grasp the physics of why Freon absorbs energy
when it becomes a gas? As a mere user, deep understanding of the things you use is generally not necessary, but if you build or maintain one of these systems you had better know what goes on under the hood.