Difference between desaturating and changing the brightness?

What is the difference between dragging the saturation slider all the way to the left to desaturate a color and dragging the brightness slider all the way to the left? Isn't desaturating (removing the color) the same as decreeasing the brightness?
Thanks.

Desaturating means dulling the colours. If you go all the way you end up with a greyscale image.
Increasing the brightness makes all the colours lighter. If you go all the way you end up with just white.

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