Files with the SND extension are attributed to Apple Inc and their Macintosh platform. The SND file format was developed for Mac OS Classic and it was mostly used for games and various programs. SND files contain commands interpreted by the Macintosh Sound Manager, sound samples and wave-table instruments.

SND files contain 8 bit mono / 8 KHz sound. Despite the low quality, using current technology SND files can reach 22 KHz for stereo and 11 KHz for mono. Also, due to their small size and basic format, SND files are often used for integrating media files into Web Documents and for Internet Streaming.