Common authentication methods for logins alike chat GPT login include the traditional username and password combination, which is simple but susceptible to breaches. Two-Factor Authentication (2FA) adds an extra layer of security by requiring users to provide two different authentication factors, such as something they know (password) and something they have (a mobile app, hardware token, or SMS code), or even something they are (biometric data like fingerprints or facial recognition). Multi-Factor Authentication (MFA) goes further, involving three or more authentication factors for enhanced security. These methods help protect user accounts from unauthorized access and data breaches, with MFA being the most robust among them.