Template spectrum and images of a galaxy at z ∼ 1 highlighting the power of the multi-wavelength data at the HST resolutions available in the HDUV survey footprint. The HDUV samples the far-UV, which is sensitive to star formation on ∼100 Myr timescales, while the WFC3/IR grism provides resolved Hα images and the star formation on ∼10 Myr timescales. Finally, the broadband imaging in the NIR samples the rest-frame optical of galaxies out to z ∼ 3 and is sensitive to the underlying mass distribution. The HDUV thus provides key insights into the internal build-up of galaxies at a spatial resolution of ∼700–800 pc out to z ∼ 1–3.