@rgb I took the first and least complicated picture I could find. Here RGB implies sRGB. It's a long story, but in a nutshell - sRGB is what ANY normal monitor MUST display. Adobe RGB is an abstract standard that allows you to describe with 3 coordinates at least CMYK (they are different for every printing press!) and sRGB along with them.

There are monitors that cover the AdobeRGB range (professional, expensive).

There are abstract color MODELs that are WIDER than AdobeRGB (even the blue coordinate goes into invisible colors there).

It's all about color gamut and the appatate problems associated with it. If it's about getting a uniform color wheel or mixing colors the way artists do, you have to use other color models "under the hood" and only give RGB to the monitor.