What is the difference between GPIOTE Driver, Abstraction, Handler, and Handling Library?

[Tosa]

I am trying to study the docs for GPIOTE in SDK12 and see various sections for GPIOTE. What are the differences between: Driver, Abstraction, Handler and Handling Library?

[Einar Thorsrud]

The GPIOTE abstraction is used by the GPIOTE driver, and as long as you use the driver (which you probably should), you don't really need to think much about it. Think of it as a lower layer of abstraction. Both the GPIOTE handling library and the GPIOTE Handler module are obsolete, and can safely be ignored.