It's a security measure used to verify your identity when logging in to accounts or making online transactions.
Here's how it works:
1. You request an OTP: You try to log in to an account or make a transaction.
2. The service sends you an OTP: The service sends you a unique, temporary code via SMS, email, or an authenticator app.
3. You enter the OTP: You enter the code into the login or transaction screen.
4. The service verifies the OTP: The service checks if the code is valid and matches the one it sent.
This process ensures that only you can access your account, even if someone knows your username and password. OTPs are a crucial part of modern security practices.