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Lepton scattering from the proton and nuclei provides snapshots of their structure. In theStandard Model, this structure is described by Quantum Chromodynamics in terms of quarksand gluons. A major goal of present and future nuclear physics is to understand quantitativelyand comprehensively the structure of nuclei in terms of QCD. Ongoing, frontier studies usingthe CLAS12 spectrometer at Jefferson Lab will be described. New targets and ion sources ofpolarized He-3 are under development and will be discussed. Finally, the future Electron-IonCollider will be introduced.