Almost every website/store has a login system and a customer has to remember or save username, password for all these stores. So, here this extension comes in place, it allows a customer to just enter his/her email address and the system will send an OTP(one-time password) to his email address. He/She can then enter that OTP on the store and securely login to the account.
What exactly this Magento extension does?
It adds a new button named "Login with OTP" to the customer login page on Magento 2 store. After clicking that button, the customer has to enter his/her email address and extension will send an OTP to the specified email address. The customer can then enter that OTP and login to the account.