Ordinary magnetoresistance (OMR) is a phenomenon where the electrical resistance of a material changes in response to an applied magnetic field. This effect occurs in various materials, particularly in metals, and is typically observed at room temperature. When a magnetic field is applied, the motion of charge carriers, such as electrons, is influenced, leading to an increase in resistance. OMR is distinct from other magnetoresistive effects, such as the Giant Magnetoresistance (GMR) seen in certain layered materials. The change in resistance due to OMR is generally small and linear, making it useful in applications like magnetic sensors and data storage devices, where precise measurements of magnetic fields are required.