Not understanding RGB in CSS?

I understand learning something new like RGB but i dont understand the point of using RGB rather than just using the word which is easier to remember. The reason im asking why is because i dont understand the usage of it. Any advice would be great, thank you.

there is like a couple dozen colors in words, but there are 17 million colors in RGB

you have a lot more freedom in choosing your colors with RGB

anyway, you don’t need to remember them, you can search for a tool online in which you can choose the colors from a continuum and it will give also RGB code

So its just a better format to use when wanting a variety of colors. Is that right? And thank you for the feedback!