Google wallet is Google's answer to electronic payment. It started out as an app to use with a smart phone and interacted with the fast pay receivers that you often see at gas stations and some fast food restaurants where you could pass your phone/tap your phone in front of the receiver and it would pay for the item you were purchasing. It eliminated the need to swipe a debit or credit card. Google has now added the electronic fund transfer capability if you have a g-mail account. I personally have never used it and believe that you need a Google account and the app to be able to use it. There are protections and anti-fraud things in place but with anything you have to know and trust the seller when making a purchase. I know people that have used it by transferring money between gmail accounts. For example, if I owed someone some money I could send it to them using my gmail account or if I was out to eat with someone and we wanted to split the bill but they wanted to charge it I could let them charge the entire bill and then send my portion to them directly using my gmal and Google Wallet.