Direct photons and thermal dileptons: A theoretical review

We discuss the measurement of electromagnetic radiation produced in heavy ion collisions at SPS energies. We review the low invariant mass dilepton sector, the real photon data, and the spectra of intermediate mass dimuons. Along with this, we discuss the theoretical interpretations of those observables.Comment: 10 pages, 5 figures. Talk given at the 15th. International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions (Quark Matter 2001), Stony Brook, NY, January 15-20, 200