Quantum mechanics is the body of scientific laws that describe the wacky behavior of photons, electrons and the other particles that make up the universe.
Quantum mechanics is the branch of physics relating to the very small. It results in what may appear to be some very strange conclusions about the physical world. Quantum mechanics (QM; also known as quantum physics or quantum theory), including quantum field theory, is a branch of physics which is the fundamental theory of nature at the smallest scales of energy levels of atoms and subatomic particles. In the video below from The Science Asylum, Nick Lucid explains some creepy things about quantum physics like, wave-particle duality and other stuff like that. So watch and learn: