Proof of identity refers to the process of verifying an individual's identity through various means. This can include documents like a driver's license, passport, or national ID card, which contain personal information such as name, date of birth, and a photograph. Organizations often require proof of identity to ensure that the person is who they claim to be, especially in situations involving financial transactions or legal agreements. In the digital age, proof of identity has expanded to include online methods, such as biometric verification and two-factor authentication. These methods enhance security by requiring additional information or physical traits, like fingerprints or facial recognition, to confirm identity. This is particularly important for protecting sensitive data and preventing fraud in online services.