The Axion Dark Matter eXperiment (ADMX) is a DOE "Generation 2" direct-detection dark matter project searching for the resonant conversion of axions to photons in a tunable, high-Q microwave cavity surrounded by a strong magnetic field. Over the last decade, ADMX has undergone multiple upgrades and is now operating with unprecedented sensitivity, able to discover or rule out even the most pessimistically coupled DFSZ QCD axions. I will motivate the axion as a dark matter candidate, present an overview of ADMX, discuss recent results and talk about the future of the experiment.