QCD predicts that at a certain critical temperature of the order of KQCD I strongly interacting matter undergoes a phase transition from the colour singlet hadronic state to a deconfined plasma of quarks and gluons. This review summarizes experimental observables that support the evidence that a new state of matter with properties as predicted for the QGP was observed at the CER.N SPS as well as novel experimental probes accessible at the RHIC heavy-ion collider at BNL.
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