What is a recovery area, Why do i have to create recovery media – Sony SVF15N26CXB User Manual

SVF13N27PXB, SVF14N23CXB, SVF14N23CXP, SVF13N23CXB, SVF14N21CXB, SVF15N25CXB, SVF15N25CXS, SVF15N28PXB, SVF13N23CXS, SVF14N2APXB, SVF13N290X, SVF14N2APXS, SVF13N27PXS, SVF14N25CXB, SVF13N24CXB, SVF15N2ACXB, SVF14N21CXS, SVF14N290X, SVF14N21CXP, SVF14N23CXS, SVF15N290X