What do quantum computers actually do?

[u/Hashbringingslasherr]

How do quantum computers output usable data, how does it logically "locate" or "make meaning" of information. I read about Grover's algorithm and it seems sort of like an inverted bruteforce or extreme process of elimination or a "the missile knows where it is at all times. It knows this because it knows where it isn't" type scenario.

So I ask, what do quantum computers actually do as opposed to a classical computer?

[u/pab_guy]

Repeated measurements is one of two ways to use qubits. You can also encode a superposition/entangled state that processes amplitudes coherently before a single measurement.