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PNG stands for Portable Network Graphic, and it is an image file format which, like the
GIF one, supports lossless data compression.
This format was created to overcome the limitations of GIF, namely to increase color support and to offer a format with no patent license.
Whereas GIFs can have either opaque or transparent icons, PNGs support an 8-bit transparency channel so that colors can fade from transparent to opaque.
PNG viewers allow users only to display these image types, but more and more apps also support basic editing functions.
These applications can also be used to export PNG images to other graphic formats.