What is m-Passbook?

According to the SBI FAQ page, “M-Passbook or mobile Passbook is yet another innovative offering through State Bank of India.This is an electronic passbook, which can be used for storing and recording your transaction account activities. Once updated, you would be able to see your transactions in your m-passbook, stored in your device. This is an added convenience to viewing and monitoring your transactions history, without contacting Banks system/server every time for retrieving transactions.”