Magnetoresistive sensors are devices that detect changes in magnetic fields by measuring variations in electrical resistance. They utilize the magnetoresistance effect, where the resistance of a material changes when exposed to a magnetic field. These sensors are commonly used in applications like automotive systems, data storage, and industrial automation. These sensors are known for their high sensitivity and accuracy, making them ideal for detecting weak magnetic fields. They can be found in various forms, including giant magnetoresistive (GMR) and tunneling magnetoresistive (TMR) sensors, each with unique properties suited for different applications.