The Electrical Resistivity Test is a geophysical method used to assess subsurface conditions by measuring the soil and rock layers’ ability to resist the flow of electric current. This test is commonly applied in geotechnical and environmental investigations to detect variations in subsurface materials, groundwater, and soil moisture content. One of its key advantages is that it is non-destructive, allowing for subsurface exploration without disturbing the ground, making it suitable for sensitive environments. It effectively identifies changes in subsurface conditions, such as fractures or groundwater presence, aiding in foundation design and hazard detection. The test is versatile, applicable in areas like groundwater exploration, soil profiling, contamination studies, and even archaeology. Its ability to cover large areas efficiently makes it a cost-effective method for preliminary site investigations, especially compared to invasive techniques like drilling. However, factors such as soil moisture variation can influence resistivity values, and the test may be less reliable in heterogeneous or coarse soils.