Audio Interchange File Format (AIFF) is a proprietary format that was developed by Apple for wrapping high-quality audio bitstreams, primarily for interchange, but flexible enough to be used as a storage format. Although AIFF can wrap many codecs, linear PCM is preferred for preservation. In general, adoption is not that high, but Apple users engaged in professional work do use it.
The FFmpeg tool can help you to convert almost any audio and video file from the command line. It is free to use, and is available for Windows, Linux and Mac operating systems. However, before depositing audiovisual material in the DANS Archive, please always contact DANS for discussion on the available formats/containers and possible migrations.
AIFF is a DANS non-preferred format for file type Audio.