A quantum computer has the potential to simulate things a classical computer could not possibly do. Quantum computers have the potential to revolutionize computation by making certain types of classically intractable problems solvable, currently there isn’t much but great progress is on its way.
In physics, a quantum is the minimum amount of any physical entity involved in an interaction. It is a very small quantity of electromagnetic energy.
Quantum computing is the study of using different branches of quantum (Quantum Physics, Quantum Mechanics, Quantum Technology) to create new ways of computing. Quantum Computing uses superposition and entanglement.
Every operation on a computer is recorded as 0s and 1s but in quantum computing it can be any one of those mingled up. Which makes Quantum Computing have multiple outcomes.
Entanglement is the name given to a special connection between pairs or groups of quantum systems. The Quantum Entanglement connection cannot be untied.