What do the colors in Theme Settings represent

I am trying to adjust the theme colors. What do each of the 6 colors represent. The first one appears to be the primary color, second one is hover color, but what else are these used for by default and what are the other 4 colors used for in the theme?

Also, the colors that I am switch to do not seem to be sticking. The original theme colors are not being replaced. My hover color is still the original color and when I click on a box to adjust settings, it gives me the original theme colors instead of the new ones I selected in Theme settings.