Quantization : a discontinuous universe
In the quantum world, particles can only assume certain energies. Imagine a car that could only run at certain specific speeds and would directly accelerate from 30 to 50 mph! Why?
Because particles are waves and do not assume just any shape: for each shape there is a corresponding energy, and that is what quantization is.
These energy levels help us to understand the atomic structure and to create new technological devices.