What is a GIF
GIF is the name of a file format for bitmap graphics and an acronym for Graphics Interchange Format.
GIF files use an 8 bits palette (256 colors) and store compressed images. The resulting media file is small and portable, compared to most other media format.
What is an animated GIF
Since GIF files can incorporate multiple images, those images can be used to create crude animated sequences. The vast majority of email clients and browsers support animated GIF.
An animated GIF is a set of image frames stored in a single file and displayed in a timed sequence. The latter sequence creates the illusion of an animation, in many ways similar to how flip books work.
GIF is the only image format compatible with all major email clients. The only exceptions are Outlook 2007 and 2013, which only display the first frame of the GIF as a static image.
- A Guide to Animated GIFs in Email published on Litmus.com
- How to Use Animated GIFs in Your Emails published on Constantcontact.com
- GIF on Wikipedia