GIF files are a type of computer image that you can use to show moving pictures or short animations. They are a popular format for sharing and displaying graphics on the internet. Full definition
You can also doodle on the photos you send, send doodles and sketches (much like Apple Watch users), and you can embed animated GIF files in your messages. (howtogeek.com)
You can then easily share these videos as GIF files in three different styles: Loop, Reverse, and Swing. (digitaltrends.com)
The S Pen allows users to send handwritten notes and even create animated GIF files from videos. (technewsworld.com)