Quantum mechanics deals with the mathematical description of the motion and interaction of subatomic particles, incorporating the concepts of quantization of energy, wave–particle duality, the uncertainty principle, and the correspondence principle.
If you just pulled a face like a perplexed and and mildly agitated monkey, this video from the exurb1a YouTube channel may provide some elucidation. It attempts to explains quantum mechanics using a concept everybody can understand: ducks.
Now, we should point out that this is a humour video first and an educational video second. (Its creator is also host of the Half Drunk and Curious podcast.) Nevertheless, it does a prety good job of explaining this insanely complex branch of mechanics using ducks as a metaphor.