Password security refers to the measures taken to protect passwords from unauthorized access. Strong passwords typically include a mix of uppercase and lowercase letters, numbers, and special characters. It is also important to avoid using easily guessable information, such as birthdays or common words. Regularly updating passwords and using unique passwords for different accounts can further enhance security. Additionally, using tools like password managers can help users generate and store complex passwords securely. Enabling two-factor authentication (2FA) adds an extra layer of protection by requiring a second form of verification, such as a code sent to a mobile device, before granting access to accounts.