nrf52: SWO purpose

[H4NNE5]

Hello

In a schematic I saw the "SWO" connection appear on the Programming/Debug connector beside SWDIO and SWDCLK.

What's it for? Of course it means "Single Wire Output", but would one need it for programming/debugging?

Thanks in advance

[FormerMember]

For programming a nRF5x device only SWDIO, SWDCLK, VDD, and GND is needed.