A Hall Effect Sensor is a device that detects the presence of a magnetic field. It operates based on the Hall effect, which occurs when a current-carrying conductor is placed in a magnetic field, causing a voltage to be generated perpendicular to both the current and the magnetic field. This voltage can be measured and used to determine the strength and direction of the magnetic field. These sensors are commonly used in various applications, such as in automotive systems for detecting the position of rotating parts, in smartphones for measuring the orientation of the device, and in industrial equipment for monitoring motor speed. Their ability to provide non-contact sensing makes them reliable and durable.