The acronym "OTP" typically stands for "One-Time Password." It is a security feature used in online services to enhance authentication. When logging into accounts or making transactions, a system generates a unique code that is valid for only a single session or transaction. This helps to ensure that only authorized users can access their accounts, as the code is sent to a device or number associated with the user.
The term "One-Time Password" is a combination of the words "one-time," meaning it can only be used once, and "password," which refers to a secret word or phrase used for authentication. The concept began to emerge as a response to the increasing need for secure online transactions and user identification.