2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/44690I review some aspects of $K$ and $B$ physics both in the context of the standard model and in some cases in a scenario which is rather different from the standard model. I discuss, in particular, where we are likely to see deviations from the standard model in the near future before new colliders are built.18 pages, report UTPT-92-13High Energy Physics - Phenomenologytext