A simplifying abstraction refers to a concept or entity that simplifies complex systems or interactions, often by hiding details that are not necessary for the task at hand.
In this context, the term "device driver" is the best example of a simplifying abstraction. Device drivers serve as a bridge between the operating system and hardware devices, abstracting away the complexity of hardware communication and allowing software applications to interact with hardware in a simplified manner.
So the answer is:
device driver