The Muon Ionization Cooling Experiment (MICE) at the Rutherford Appleton Laboratory is an experiment designed to measure ionization cooling of muons, essential for future muon accelerator facilities, such as a Neutrino Factory or a Muon Collider. The experiment took data between 2015 and 2017, collecting about 350 million muon events traversing a liquid hydrogen (LH2) or a lithium hydride (LiH) absorber after passing through a series of superconducting focusing magnets in a variety of optical configurations. Measurements of the muon beam upstream and downstream of the absorber are used to characterise multiple Coulomb scattering and energy loss of muons in the absorber material and enable the measurement of ionization cooling for the first time.