What is One-Time Password (OTP)?

A one-time password (OTP) is a special authentication code that is typically used to log into a specific network or service through a mobile device. OTPs are typically time sensitive and only last until the next code is generated (usually every 30 seconds). OTPs are often used through a mobile authentication application such as Google Authenticator, Okta Verify, or Authy. OTPs are more secure than a password and are typically used to supplement them as a security measure.