What is quantum physics in the most layman terms?

Quantum physics in layman's terms is physics of very small, extremely small particles. These particles are fundamental building blocks of our universe. In this realm, laws of physics are somewhat different. So it may look spooky to some and not-a-science to others.-- Wave particle duality. read more

Quantum fluctuations are a popular buzzword for the statistical triviality that the variance (the spread of values) of a random variable A (in context of quantum physics, this could be the position of a particle or the amount of energy that it has) with zero mean is typically not zero - except that A is now an operator. read more

In "layman's terms", a quantum state is simply something that encodes the state of a system. The special thing about quantum states is that they allow the system to be in a few states simultaneously; that's called a "quantum superposition". read more