Quantum Theory: This is a branch of physics that deals with phenomena on a very small scale (like atoms). It's like the rule book for how particles behave at this level.
Photon:A photon is a particle representing a quantum of light or other electromagnetic radiation. It carries energy proportional to the radiation frequency but has zero rest mass. Imagine it as an invisible courier delivering packets of light energy from one place to another.
Wave-Particle Duality:This concept in quantum mechanics suggests that every particle or quantic entity may be described as both a particle and wave. Like being able to play two roles in a movie, particles can act as both individual actors (particles) and crowd scenes (waves).