This type has been deprecated in favor of one of it's alternatives. While you should likely still support it, it should not be your first choice if assigning a MIME type.
Instead please use image/png

Portable Network Graphics (PNG) was devised starting in a discussion on newsgroup in 1995, with the first version of its specification released in 1996. The motivation for its creation was to create a free and unencumbered image format in the wake of the patent issue with GIF.

Used in file types
  • .png
This type may also appear as
  • image/vnd.mozilla.apng
  • image/png
Further reading
  1. Internet Assigned Numbers Authority (IANA)

  2. Let's Solve the File Format Problem!