Quantum mechanics is a branch of physics that studies the behavior of particles at the atomic and subatomic level. It's like trying to fix your car's engine, but instead of using wrenches, you use tiny, tiny hammers and a lot of math.
Key concepts in quantum mechanics include wave-particle duality, superposition, and entanglement. Don't worry if you don't understand them yet; just remember that they're like trying to explain why your cat is plotting against you.
Learn more about entanglement or try to understand wave-particle duality.
For those who are new to quantum mechanics, we recommend starting with our Beginner's Guide or our Quantum Mechanics 202: Advanced Topics for those who want to really get their hands dirty.