Lattice QCD at Finite Temperature and Density

We review recent results on QCD at finite temperature and non-vanishing baryon number density. We focus on observables which are of immediate interest to experimental searches for the Quark Gluon Plasma, i.e. the phase transition temperature, the equation of state in two and three flavour QCD and thermal effects on hadron masses. Some new developments in finite density QCD are also presented.