# - Definitions
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2D barcode (two-dimensional barcode)
A 2D (two-dimensional) barcode is a graphical image that stores information horizontally as one-dimensional barcodes do, as well as vertically.
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4G (fourth-generation wireless)
4G is the short name for fourth-generation wireless, the stage of broadband mobile communications that supersedes 3G (third-generation wireless) and is the predecessor of 5G (fifth-generation wireless).
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802.11
802.11 is a family of evolving specifications for wireless local area networks (WLANs) developed and maintained by a working group of IEEE.
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802.11n
802.11n is an IEEE standard for wireless networking that boosts the speed, dependability and range of wireless transmissions in wireless local area networks (WLANs).