What do the hardware and software form together?
Hardware performs the computations, software is a set of
instructions we use to tell the hardware what we want it to do.
Basically hardware is what carries out the work, and software is
what we use, and what we program into it.
how does hardware work?
If the Q. is what is the HW-SW interface which enables us to use
both of them as a system, i would say the instruction set.
The Instruction set is the HW-SW interface , instructions are
"signals" for the hardware and at the same time appear as
instructions to the programmer.This is the bridge between and us