Gamut
The full range of colours a screen, a file or a printer can actually show.
See it in Color palette. Pick a very bright Base colour: a palette can only use colours inside the screen's gamut.
In plain words
No screen can show every colour the eye can see. The set it can show is its gamut. Colours outside it get pulled in to the nearest colour it can make. Newer phones and laptops have wider gamuts than older screens, so the same file can look more vivid on them. Printers have gamuts too, which is why bright screen greens often print dull.