Biometric data refers to unique physical or behavioral characteristics that can be used to identify individuals. Common examples include fingerprints, facial recognition, iris patterns, and voice recognition. This type of data is increasingly used in security systems, such as smartphones and security cameras, to verify a person's identity. The collection and use of biometric data raise privacy concerns, as it can be sensitive and difficult to change if compromised. Organizations must ensure they handle this data responsibly, adhering to regulations and protecting individuals' rights. Technologies like biometric scanners and authentication systems rely on this data for secure access.