In this modern era, user authentication has become vital regarding security and privacy in keeping their information and valuables safe. Password or pin-based authentication systems are insufficient to protect the security of individuals. People now anticipate more dependable and secure biometric authentication systems as a result of virtualization in both academics and industry. In this study, we discussed biometrics, various biometric authentication methods, and the work in each biometric system. We summarised and emphasised the significant contribution made by several researchers in this field. Our goal is to present a thorough analysis that may throw light on the important contributions and aid researchers looking to contribute their work to biometrics.