What is the sync button on switch controller?

Question

If you're trying to pair a new controller or Joy-Con, you'll want to hold its SYNC button for about five seconds before moving on to the next steps. On Oct 14, 2019:

Hagrid P Hazard · Accepted Answer

If you're trying to pair a new controller or Joy-Con, you'll want to hold its SYNC button for about five seconds before moving on to the next steps. On Oct 14, 2019:

What is the sync button on switch controller?

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