MKV
GIF files
MKV (Matroska Video) is an open, free multimedia container format that can store video, audio, and subtitles. It is known for its flexibility and support for various codecs.
GIF (Graphics Interchange Format) is an image format known for its support of animations and transparency. GIF files store multiple images in a sequence, creating short animations. They are commonly used for simple web animations and avatars.