Magnetic properties of surfaces and interfaces in magnetically ordered materials have been attractive subjects in the field of magnetism research since around 1970 when the dead layer model was proposed. The present author applied Mössbauer spectroscopy for the study of this issue and denied the existence of magnetically dead layers in electrodeposited metal surfaces. In this article, it is introduced that a unique information can be obtained from Mössbauer spectroscopic measurements for the study of interface magnetism. The giant magnetoresistance (GMR) effect was discovered in 1988 in nanostructured magnetic multilayers and as an impact from this effect, the cultivation of a new branch in magnetism, “spintronics,” has been initiated. Magnetoresistance (MR) phenomena have been extensively studied and the tunneling magnetoresistance (TMR) effect was found to exhibit much larger magnetoresistance (MR) ratios than GMR, at room temperature. The MR phenomena, GMR and TMR, are interested not only from fundamental aspects but also from the viewpoints of technical applications. A great progress of magnetic recording technologies has been achieved by adopting GMR (and lately TMR) heads, with utilizing the principles of GMR and TMR. Since the role of interface is crucial in the processes of spin-dependent electron transport, the interface magnetism studies have attracted renewed attention. In this review, the recent developments in experimental studies on interface magnetism in relation to spintronics are described and the following two matters are featured. One is the temperature dependence of magnetization in the topmost interface layers, which is an important parameter to obtain a large MR ratio at room temperature. The other is voltage effects on magnetic properties. In metallic materials, an externally applied electric field can induce a significant change of the electronic structure solely at the topmost interface layer contacting with an insulating material. In other words, voltage effects on the magnetic properties of metallic materials are the subjects essentially belonging to the category of interface magnetism. A recent topic of particular interest is the influence of electric field on magnetic anisotropy. If the change of anisotropy caused by an electric field is satisfactorily large, the magnetization switching can be driven by an electric field, which will be a favorable technique concerning the energy consumption. Finally a possible reason why the dead layer model had been proposed for electrodeposited metal films is speculated.