  The status of Giant Magneto-Impedance effect is reviewed in Wires, Ribbons
and Multilayered Soft Ferromagnetic Thin Films. After establishing the
theoretical framework for the description of the effect, and the constraints
any material should have in order to show the effect, experimental work in
Wires, Ribbons and Multilayered Thin Films is described. Existing and potential
applications of the effect in Electronics and Sensing are highlighted.
