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Quantum Mechanics, as part of the hierarchy Science/Mathematics/General Relativity, delves into the behavior of matter and energy at extremely small scales - far smaller than can be observed with traditional microscopes. It introduces concepts such as wave-particle duality, superposition, and quantum entanglement that defy classical intuition. This field of study is deeply rooted in mathematics, using complex equations to describe quantum systems. While General Relativity primarily focuses on large-scale phenomena like galaxies and black holes, Quantum Mechanics explores the microscopic world of atoms and subatomic particles. Despite their differences, both theories are fundamental pillars of modern physics, and efforts continue towards reconciliation through approaches like quantum gravity and string theory.