You are getting ready to make a purchase at a local store when you realize you have forgotten your debit card. You do have your phone and the cashier informs you that you can use mobile payment to complete the transaction. What connection method would need to be enabled to pay from your mobile device?
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Answer Description
Near-field communication (NFC) is a short range communication method used frequently in mobile phones for purposes such as mobile payment and device transfers. Bluetooth is also considered short range but has a substantially further range than NFC.
Wikipedia
Near-field communication (NFC) is a set of communication protocols that enables communication between two electronic devices over a distance of 4 cm (1.57 in) or less. NFC offers a low-speed connection through a simple setup that can be used to bootstrap more capable wireless connections. Like other "proximity card" technologies, NFC is based on inductive coupling between two antennas present on NFC-enabled devices — for example a smartphone and a printer — communicating in one or both directions using a frequency of 13.56 MHz in the globally available unlicensed radio frequency ISM band using the ISO/IEC 18000-3 air interface standard at data rates ranging from 106 to 848 kbit/s.
The NFC Forum has helped define and promote the technology, setting standards for certifying device compliance. Secure communications are available by applying encryption algorithms as is done for credit cards and if they fit the criteria for being considered a personal area network.NFC standards cover communications protocols and data exchange formats and are based on existing radio-frequency identification (RFID) standards including ISO/IEC 14443 and FeliCa. The standards include ISO/IEC 18092 and those defined by the NFC Forum. In addition to the NFC Forum, the GSMA group defined a platform for the deployment of GSMA NFC Standards within mobile handsets. GSMA's efforts include Trusted Services Manager, Single Wire Protocol, testing/certification and secure element. NFC-enabled portable devices can be provided with application software, for example to read electronic tags or make payments when connected to an NFC-compliant system. These are standardized to NFC protocols, replacing proprietary
Near-field_communication - Wikipedia, the free encyclopedia 