Quantum discord captures quantum correlations beyond entanglement. A separable (unentangled) two-qubit state can still have nonzero quantum discord — meaning classical measurement disturbs the state. The Werner state ρ = p|Ψ⁻⟩⟨Ψ⁻| + (1−p)I/4 is entangled for p>1/3, but has discord for all p>0. Explore how discord and concurrence differ across state families.