User identification is the process of recognizing and verifying the identity of individuals accessing a system or service. This is often achieved through unique identifiers such as usernames, email addresses, or biometric data like fingerprints. The goal is to ensure that only authorized users can access sensitive information or perform specific actions. Effective user identification is crucial for maintaining security and privacy in digital environments. It helps prevent unauthorized access and protects personal data. Common methods include passwords, two-factor authentication, and security questions, which add layers of protection to user accounts and enhance overall system integrity.