Quantum Mechanics:Quantum mechanics is a branch of physics that describes the behavior of matter and energy at very small scales, such as atoms and subatomic particles.
Photon:A photon is a quantum of light or electromagnetic radiation. It behaves both as a particle and a wave.
Energy Quantization: Energy quantization refers to the concept that energy levels in atoms are discrete rather than continuous, meaning they can only exist at specific values rather than any value within a range.