Synchronized charts share a crosshair, highlighted point, and tooltip, so hovering one chart updates the others - handy for dashboards where several charts share the same time axis.
When several charts share an axis - usually time - and you want to read them together; moving the cursor on one lines up the same point on all of them.
Put the charts in the same sync group; they then coordinate their crosshair, active point, and tooltips.
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