Magnetic sensors are not a single brand but a category of devices used to detect magnetic fields or changes in them. These sensors are produced by various companies worldwide, including leading manufacturers like Honeywell (USA), TE Connectivity (Switzerland), and Allegro MicroSystems (USA). They serve industries such as automotive, industrial automation, consumer electronics, and healthcare. Key products include Hall-effect sensors, magnetoresistive sensors, and reed switches, which are used for position sensing, speed detection, and current measurement applications.