Question

WHAT IS QUANTUM PHYSICS???

Answer 1

Quantum physics is the study of the behaviour of microscopic particles. It is one of the pillar of modern physics. In this common sense has no place.

Answer 2

Quantum Physics can be used synonimically to Quantum Mechanics and even Quantum Theory. Quantum Physics is theory which try to explain why Classical Mechanics doesn't work in cases for example very small particles or also explains some "more visible" phenomenon like superconducting.