Electrical Resistivity Tomography (ERT) is a geophysical imaging technique used to investigate the subsurface of the Earth. It works by measuring the electrical resistivity of soil and rock layers, which can vary based on their composition, moisture content, and temperature. By injecting electrical currents into the ground and recording the resulting voltage differences, ERT creates a detailed image of the underground structures. This method is commonly used in environmental studies, engineering, and resource exploration. ERT helps identify groundwater resources, locate contaminants, and assess geological hazards. Its non-invasive nature makes it a valuable tool for researchers and engineers alike.