The MRI main field strenth has been constantly increased over the past decades. Today, scanners with 3T, 7T and even beyond are in use, however ultra-high field (≥7T) systems are mostly used in research centers although the transition into hospitals is expected. The reasons for using (ultra-)high fields are multifold and will be outlined in this presentation. Along with these benefits go a larger range of challenges, which are among the reasons for the rather slow transition of UHF into clinical applications. Solutions to most of these challenges will be presented and applications will be highlighted.