A password is a secret word or phrase used to gain access to a computer system, account, or service. It helps protect personal information and ensures that only authorized users can access certain data. Passwords are typically a combination of letters, numbers, and symbols to enhance security. To create a strong password, it is recommended to use a mix of uppercase and lowercase letters, numbers, and special characters. 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 against unauthorized access.