Resource Interchange File Format

RIFF
Internet media typeapplication/x-riff
Initial releaseAugust 1991 (1991-08)
Type of formatContainer format
Extended fromInterchange File Format
Extended toAVI, ANI, PAL, RDIB, RMIDI, RMMP, WAV
Open format?Yes
Free format?Yes

Resource Interchange File Format (RIFF) is a generic file container format for storing data in tagged chunks. It is primarily used for audio and video, though it can be used for arbitrary data.

The Microsoft implementation is mostly known through the container formats AVI, ANI and WAV, which use RIFF as their basis.