OTP stands for "one-time password" and is a form of strong authentication that provides better protection to e-banking, corporate networks, and other sensitive data. OTPs are more secure than static passwords because they are valid for only one login session or transaction. OTPs can be numeric or alphanumeric strings of characters that are automatically generated and can be used only once. OTPs can replace authentication login information or can be used in addition to it to add another layer of security. OTPs can be generated using hardware, software, or on demand. OTP authentication is used in various industries, including healthcare, e-commerce, and government, to secure sensitive data and prevent fraudulent activities. OTPs can be delivered through SMS, email, or mobile device apps. There are several reliable and secure authenticator apps available for free download, such as Microsoft Authenticator, LastPass Authenticator, and Google Authenticator.