The
Swatches palette (Window > Swatches) stores colors that
you use often. You can add or delete colors from the palette or
display different libraries of colors for different projects.
To
choose a foreground color, click a color in the Swatches palette.
To
choose a background color, Ctrl-click (Windows) or Command-click (Mac OS)
a color in the Swatches palette.
Note: Change how swatches are displayed by choosing an option
from the Swatches palette menu.