Abstract: The recent discovery of superconductivity in Sr-doped NdNiO2 has refocused attention on the relation of nickelates to cuprates. First I review the experimental situation, including earlier work on trilayer nickelates, as well as the new work on infinite-layer nickelates. Next I comment on various proposed models, including charge-transfer, Mott, and Kondo. Then I relate these models to the electronic structure of nickelates, contrasting this with cuprates. Finally, I comment on relevant parameters in regards to the observation of superconductivity.