A passphrase, also known as a secret phrase, is a sequence of words used to secure access to a computer system or online account. This combination of words, often longer than a typical password, aims to enhance security by making the authentication process more complex. Generally, a passphrase is created by combining several words that are meaningful to the person choosing it, making it both easier to remember and harder for unauthorized individuals to guess. Its use is common in cybersecurity to protect sensitive data and ensure the integrity of confidential information.