The cosmic neutrino background is a firm prediction of Lambda-CDM cosmology, which at present remains undetected. A successful detection of the cosmic neutrino background could give deep insight into the evolution of the universe, aid in the determination of the absolute neutrino mass, and potentially distinguish between Dirac and Majorana
neutrinos. In this talk, I will give a brief introduction to the cosmic neutrino background, before giving an overview of relic neutrino detection proposals. Time allowing, I will then summarise the present-day constraints on cosmic neutrino background parameters, from both theory and experiment.