Gif is a abbreviation of png.

In computing terms the difference between png and gif

is that png is alternative form of PNG|lang=en; Portable Network Graphics, an open protocol for digital s while gif is a bitmap image format for pictures with support for animations and up to 256 distinct colors per frame, including a fully transparent color.

As an abbreviation png

is alternative form of PNG|lang=en; Portable Network Graphics, an open protocol for digital s.

As a noun gif is

alternative case form of GIF.

As a verb GIF is

to create a GIF file of (an image or video sequence, especially relating to an event).