Q: What does "PNG" image mean?

A: Portable Network Graphics (PNG) is a bitmapped image format that employs lossless data compression. PNG was created to improve upon and replace GIF (Graphics Interchange Format) as an image-file format not requiring a patent license. The PNG acronym is optionally recursive, unofficially standing for “PNG's Not GIF”. PNG supports palette-based (palettes of 24-bit RGB colors), greyscale, RGB, or RGBA images. PNG was designed for transferring images on the Internet, not professional graphics, and so does not support other color spaces (such as CMYK).