There are two color boxes that represent Foreground and
Background colors for Photoshop
You can find both at the bottom of the Tool Box palette.
The Foreground is the box at the left, while the background is the box at
the right
The default colors for them is black and white
You can always switch between both of them by the double headed arrow
above them
You can always reset the background and foreground colors by clicking on
the reset button above them too
You can change the color of either one of them by clicking on it's box,
and that would open the color Picker box. Or by
choosing the eyedropper tool.
- The Background Color: The background color is the color that would appear when
you use the background eraser, or a gradient fill sometimes
- The Foreground Color: It's the color that you paint, fill, draw, and write
with.