What is Quantum?
Quantum is the Latin word for amount and we use it to mean the smallest possible discrete unit of any physical property, such as energy or matter. For example, the smallest amount of electricity is a single electron, and the smallest unit of light is a photon. The science of these small particles is called quantum mechanics.
Quantum mechanics is a fundamental theory in physics that provides a description of the physical properties of nature at the scale of atoms and subatomic particles. Classical physics theories describe many aspects of nature at a macroscopic (ordinary) scale, but is not able to describe the subatomic scale.
Quantum information science (QIS) is an area of STEM that makes use of the laws of quantum physics for the storage, transmission, manipulation, processing, or measurement of information.