Does this capacitor really required?

Looking at the schematic of the docs I could see this capacitor:
Is this capacitor really required? If yes, what are the specifications for it?

The capacitor is not required, but if your power-supply is a bit nosey or pulls too much current, it can help smooth out the noise, and cause less problems. (this is very useful if you have VERY long strings of LEDs) I have a few LED strings that are all 5v that I deliberately didn’t install the cap, and they work perfectly.

Thanks a lot. Any 1000uF capacitor will do? Or the cap should have a specific voltage?

should be twice of power supply voltage

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Thanks a lot