RIFF (Resource Interchange File Format) is the tagged file structure developed for multimedia resource files. The structure of a RIFF file is similar to the structure of an Electronic Arts Interchange File Format file (EA IFF). RIFF is not actually a file format itself (because it does not represent a specific kind of information), but its name contains the words "interchange file format" in recognition of its roots in IFF.
RIFF has a counterpart, RIFX, that is used to define RIFF file formats that use the Motorola** integer byte-ordering format rather than the Intel** format. A RIFX file is the same as a RIFF file, except that the first four bytes are 'RIFX' instead of 'RIFF', and integer byte ordering is represented in Motorola format.