Quantum Mechanics:Quantum mechanics is the branch of physics that deals with the behavior and interactions of particles on very small scales, such as atoms and subatomic particles.
Probability Density:Probability density refers to the likelihood per unit volume or space for finding a particle at any given point in space. It is derived from the square magnitude of the wave function.
Superposition: Superposition refers to the ability of quantum systems to exist in multiple states simultaneously until measured or observed, whereupon it collapses into one specific state.