Portable Network Graphics

Portable Network Graphics (.png) is an extensible file format for the lossless, portable, well-compressed storage of raster images. PNG provides a -free replacement for GIF and can also replace many common uses of TIFF. Indexed color, grayscale and RGB images are supported, plus an optional alpha channel. Sample depths range from 1 to 64 bits per pixel.

Description
PNG is designed for online viewing applications, such as the World Wide Web, so it is fully streamable with a option. PNG is robust, providing both full file and simple. Also, PNG can store and  data for improved color matching on various platforms.