Magnetic sensors are devices that detect changes in magnetic fields. They are commonly used in various applications, such as smartphones, automobiles, and industrial equipment. These sensors can measure the strength, direction, and changes in magnetic fields, allowing them to perform functions like navigation and position sensing. There are different types of magnetic sensors, including Hall effect sensors and magnetoresistive sensors. Hall effect sensors work by producing a voltage when exposed to a magnetic field, while magnetoresistive sensors change their electrical resistance based on the magnetic field strength. Both types play crucial roles in modern technology.