2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/97541A chapter to be included in "The DA$\mitΦ$NE Physics Handbook" by the DA$Φ$NE Theory Working Group, this paper covers the phenomenology of low--energy $K N$ physics, with particular emphasis on the problems still to be solved by a careful experimental investigation and on the theoretical tools to analyse it.20 pages, PlainTexNuclear TheoryHigh Energy Physics - Phenomenologytext