Some say there will be a day when the wallet you carry in your pocket or purse will become obsolete. Technology is evolving in a way that will likely eliminate all our credit cards, store cards, and IDs. We will use our mobile devices as our primary means of commerce and identification. The technology behind mobile wallet combines near field communications (NFC) and applications. Depending on which is used, a user might need to wave their phone near a reader to make a payment or verify identification, or they may open an app and simply click a button.
http://robertsiciliano.com/blog/2013/05/30/what-is-a-mobile-wallet-2/