The seismo-electromagnetic method is used for non-invasive subsurface exploration, showing interesting results for detecting fluids such as water, oil, gas, CO₂, or ice, and to better characterize the subsurface in terms of porosity, permeability, and fractures. We describe theoretical background, the role of key parameters, recent theoretical and numerical developments, and field and laboratory observations to show that this method can bring advantages compared to classical geophysical method.