The whole topic of color management can get pretty dry and technical, but stick with it because there’s information here that’s useful and puts lots of other things in context.
A technical term for describing the range of colors a device can display, such as a computer monitor. It also describes the theoretical 'color spaces' used in color management. For example, the sRGB color space used universally by digital devices for capture and display has a somewhat narrower color gamut than the Adobe RGB color space used in publishing. These are technical distinctions that are important to technicians and when choosing monitors but often not visible in casual viewing.