communication technology

What is NFC? How does NFC work?
nfc is a mainstream wireless technology, thanks to the development of online payment systems like samsung pay and google pay, especially when it comes to high-end devices and even more mid-range options.
USB 3.0 port is the mainstream of 2012?
usb 3.0 port brings data transfer capability 10 times higher than usb 2.0 and may become the mainstream in 2012.