Magnetic sensors are the sensors which are mostly used in security purposes. These sensors are often referred to as switches or contacts. They are usually placed on doors, windows or other access points from where they are not visible to others. Magnetic sensors are also used for linear angle and position measurement in automotive, speed, linear position, rotational speed, consumer and industrial applications. Magnetic sensors have applications in various fields including global positioning system, satellite system, nanotechnology, biomedical and many others. Some more classified applications of magnetic sensors include appliances, commercial, instrumentation, motion control, InfoTech and others.