There are two primary considerations:
go to file , click save as
Are you talking about 'gif' not 'giff'? if you are than a gif is an industry standard raster graphic or image format. To make it simpler incase you didn't understand, it is an image that is animated, or could be a picture put into a gif form.
Any image that moves, or has a repeated action would end with '.GIF' or the movement would not be possible.
Change the .gif file to a .mov file
There is only one file that the name ends with GIF. The only file that ends with GIF is saving a picture.
GIF and PNG 8 file formats.
A .gif file is a picture. It is not as compressed as a .jpg file so it appears larger than normal.
Well i believe it would bet a gif file, as in the extension .gif
Jpeg, gif, tiff
Animated images would use a .gif format.
A .GIF is a file and is saved like any other file.
mpeg