tl;dr: The LHC has shut down after its final physics run to begin Long Shutdown 3 (LS3), a major upgrade program running until 2030 to transform it into the High-Luminosity LHC (HiLumi LHC), which will boost luminosity up to tenfold. The work includes replacing 1.2 km of magnets, major overhauls of the ATLAS and CMS detectors (new trigger systems, silicon trackers, picosecond-timing detectors), and renovations across CERN's accelerator complex. Beam operations are expected to gradually resume in 2028, with HiLumi LHC physics starting in 2030.