When you move the mouse over a particular point, the tooltip displays the values of that point. By default, its display format looks like x value : y value. For example: 2000 : 20.
The ToolTip template refers to the use of HTML elements like image and tables in the tooltip through the template property of the tooltip. Since HTML elements such as div, image, table, etc., are used, you can style the ToolTip template by using the CSS and it appears more attractive than the default tooltip. The online sample for tooltip template is available in the following link:
Difference between tooltip format and template:
In general, ToolTip format is used to format the values displayed in the tooltip; whereas, ToolTip template is used to customize the appearance of the tooltip.
In the following code example, the first series is rendered with the ToolTip template, the next with specified ToolTip format, and the last series is rendered with the default tooltip.
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