Quantum mechanics is the branch of physics that deals with the behavior of particles at the atomic and subatomic levels. It provides a framework for understanding the behavior of matter and energy at these small scales, where classical mechanics and classical electromagnetism laws do not apply.
The behavior of particles in quantum mechanics is described using complex mathematical formalisms, including the Schrödinger equation, matrix mechanics, and Dirac notation.
Quantum mechanics has numerous practical applications in fields such as chemistry, material science, electronics, and quantum computing. It underpins our understanding of atomic and molecular structure, spectroscopy, and the behavior of semiconductors.