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What is NFC?
NFC means Near Field Communication.It is a set of standards for smartphones and similar devices to establish radio
communication with each other by touching them together or bringing
them into proximity, usually no more than a few centimeters.
NFC builds upon RFID(RADIO FREQUENCY IDENTIFICATION) systems by allowing two-way communication between endpoints, where earlier systems such as contactless smart cards were one-way only. It has been used in devices such as Google Nexus, running Android 4.0 Ice Cream Sandwich, named with a feature called "Android Beam" which was first introduced in Google Nexus.
NFC devices can be used in contactless payment systems, similar to those currently used in credit cards and electronic ticket smartcards, and allow mobile payment to replace or supplement these systems.
With the release of Android 4.4, Google introduced a new platform
support for secure NFC-based transactions through Host Card Emulation
(HCE),
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for payments, loyalty programs, card access, transit passes, and other
custom services. With HCE, any app on an Android 4.4 device can emulate
an NFC smart card, letting users tap to initiate transactions with an
app of their choice. Apps can also use a new Reader Mode so as to act as
readers for HCE cards and other NFC-based transactions.
NFC can be used in social networking situations, such as sharing contacts, photos, videos or files,
and entering multiplayer mobile games
IPHONE 6 EXPECTED TO HAVE NFC TECHNOLOGY 
There's more evidence Apple is diving into the world of mobile payments with its next iPhone.
Wired, citing people familiar with the matter, reported Thursday
that NFC, or near-field communication, is coming to the hotly
anticipated iPhone 6 and will power a new mobile-payment platform on the
device. NFC allows for touchless, short-distance interaction between a
mobile device and other objects, often used to allow payments at a
register or a quick way for one phone to recognize another.
