Application of “Gauge-String Duality”, or “AdS/CFT”, to high-energy collisions in QCD will be discussed. The special role of “graviton” in an AdS-like space-time in high-energy hadron collisions will be explained. Effect of confinement will also be elucidated. Applications to Deep Inelastic Scattering at Small-x and the possible detection of diffractively produced Higgs particle will also bediscussed.