The main use of biometric sensors in security systems is to provide reliable and secure authentication methods. These sensors capture unique physical traits, such as fingerprints, facial recognition, or iris patterns, ensuring that only authorized individuals can access sensitive areas or information. Biometric systems are often more secure compared to traditional methods like passwords or PINs, as they rely on inherent characteristics that are difficult to replicate or steal. This technology enhances physical security and serves as a critical component in various applications, including mobile devices and high-security facilities.