GIF is the same as gif, it's just that it has been capitalized.
you cant i dont think :)
GIF87a is the original format for GIF images. GIF89a included support for multiple images in the file, as well as support for animation.
When referring to .gif images, the gif stands for Graphic, or Graphics Interchange Format.
its an animationhope it helps
How to Save an Image as a GIF in Photoshop CS3
Mac Tip: How To Make GIF Files
How to Save an Image in Paint.NET
Create GIF animation Online, Free at Glickr.com