Indian Overseas Bank is a type of public sector bank of India.
It was formed in the year 1937.
Its head office is located in Chennai, Tamil Nadu, India.

Its products are:
Loans,
Credit cards,
Savings,
Investment vehicles

As you have asked about the verified by Visa service of Indian Overseas Bank, I am giving you information about it, check below for the details

Verified by Visa (VBV) is an easy to use, secured online payment service from IOB that lets you shop securely online with your existing IOB Visa Debit/Credit Card.
This service through a simple checkout process, confirms your identity when you make purchases on the Internet.
Verify By VISA password is a third factor authentication for ECOM transactions
The same can be created by the card holder only after keying in the valid card credentials.
It is the card holder’s responsibility to keep the secrecy of Verify By VISA password as in the case of ATM Pin.
Internet e-commerce transactions done using the Debit Card number are deemed valid approved transactions when authenticated by Verify by Visa password (VBV)