A Branch of physics
The basic ideas behind quantum physics are Heisenbergs uncertainty priciple and Schrodingers wave equation. Quantum Physics mostly describes the behaviour of very small particles like electrons and atoms. It states that such particles cannot be described by the laws of classical physics (as stated by Isaac Newton). Instead, they are assigned a probability wave, which actually describes the chances of finding that particle in a particular place. The name Quantum is derived from one of the effects described in quantum physics: the quantisation of energy, which means that an amount of energy can´t just be any amount but can only have certain quantities.