Capacitors are energy-storage devices that filter the high frequencies. A cap lets the tone control roll off the treble response, progressively warming the tone. The higher the value, the more bass output from the tone control at its "zero" setting.
A cap wired to a potentiometer creates a standard tone control, as explained in this Article:
How a tone control works.
.001uF (microfarad) is for volume control treble-bleed circuits. .022uF and .047uF are guitar tone control caps; .047uF and .100uF are for basses. 180pF (picofarad) is for PRS guitar volume clarity.
These identification codes are printed on the caps:
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