Minimal models M(p,p') are the simplest rational CFTs, with central charge c = 1 − 6(p−p')²/pp'. They have a finite number of primary operators with conformal dimensions h_{r,s} = ((p'r − ps)² − (p−p')²) / (4pp') forming the Kac table. The Ising model M(2,3) has c=1/2 with operators ε (h=1/2) and σ (h=1/16). Two-point functions on the cylinder encode the spectrum via state-operator correspondence.