PNG: Portable Networks Graphic

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By POV-Ray source code - Own work: Rendered in POV-Ray by user:ed_g2s., CC BY-SA 3.0,

Portable Network Graphics (PNG, officially pronounced /pɪŋ/ PING, sometimes pronounced /ˌpiːɛnˈdʒiː/ PEE-en-JEE) is a raster-graphics file format that supports lossless data compression. PNG was developed as an improved, non-patented replacement for Graphics Interchange Format (GIF) — unofficially, the initials PNG stood for the recursive acronym "PNG's not GIF".