1. The chart tooltip is used to set the tool tip in the chart, the tooltip display the value of X-Axis and Y-Axis in the chart. By default, it stays enabled and shows the disabled tooltip option in control menu.

as you can see in the below figure, the chart displays the value and category axis data by default.

2.

In the tooltip text, the default series name displays series name and Point X & Point Y displays the X-Axis value and Y-Axis value in chart.