The article presents biometric systems from three different standpoints. Technological standpoint, where the focus is laid on biometric system usage by the general public. Explaining basic terms and difficulties using various biometric characteristics. It also shortly describes how recognition works in several biometric characteristics (fingerprint, face, iris, and signature). After that is the legal standpoint, which is focused mainly on European Union law, where the often-mentioned GDPR is discussed, this basic legal regulation places a significantly higher standard than the previous legislation on the processing of biometric data as a particular category of personal data. Lastly, the article shows a sociological standpoint. In that part, different attitudes towards biometric technologies are discussed within the world population and different groups of the Czech Republic population. In the latest survey done by the authors in 2020 was found that age, and education play a vital role in the knowledge about biometric systems.