Superposition
A quantum particle exists in multiple states until measured. Schrodinger's cat thought experiment illustrates the paradox at macro scale.
Entanglement
Two particles can remain linked across distance. Measuring one instantly affects the other. Einstein called it spooky action.
Why It Matters
Quantum effects power lasers, MRI machines, and emerging quantum computers that solve problems classical chips cannot.
Everyday Impact
You do not see quantum weirdness at breakfast. But transistors, chemistry, and future encryption all depend on it.