Quantum theory is the theoretical basis of modern physics that explains the nature and behavior of matter and energy on the atomic and subatomic level. The nature and behavior of matter and energy at that level is sometimes referred to as quantum physics and quantum mechanics.
Quantum mechanics (QM) is the part of physics that tells us how the things that make up atoms work. QM also tells us howelectromagnetic waves like light work. a quantum of energy is a specific amount of energy. Light sources such as candles orlasers shoot out (or "emit") light in bits called photons. Photons are like packets. Each one has a certain little bit of energy.
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