We recently detailed 'Other' iOS storage, an iTunes-reported section that includes various caches and temporary system files on you iPhone, iPod touch and iPad along with device settings, high-quality Siri and Voice Over voices and other system data.
Not many people know that macOS reports 'Other' storage on Macs, too. Unlike its iOS counterpart, the 'Other' Mac storage basically counts non-media files that don't fit any other category.
In addition, files not recognized by Spotlight are classed as 'Other' storage, among other items. Here's precisely what files are included in the 'Other' storage section, how to see its size, why your disk's used space appears as 'Other' storage when you startup up your Mac in Safe Mode and more.