Portable Network Graphics (PNG) is one of the popular raster formats in web graphics with lossless compression. It was offered in 1995 at the Usenet conference as a free alternative to the licensed GIF. Since October 1, 1996, it exists as a full-fledged graphics format, supported by all browsers and graphics editors.
PNG - great for webmasters due to good compression without loss of quality, fast loading, transparency function, clear image borders. It is convenient to use it for logos, icons, icons, diagrams, document scans.