A Macintosh User Group (MUG) is a users' group of people who use Macintosh computers made by Apple Inc. or other manufacturers and who use the Apple Macintosh operating system (OS). These groups are primarily locally situated and meet regularly to discuss Macintosh computers, the Mac OS, software and peripherals that work with these computers. Some groups focus on the older versions of Mac OS, up to Mac OS 9, but the majority now focus on the current version of Mac OS, Mac OS X. This user group began with the formation of the Apple User Group Connection.