What is displayed by default in the tooltip of any visual created?

The default content displayed in the tooltip of any visual created is the fields used for that visual. Tooltips are designed to provide contextual information about the data points displayed. When a user hovers over a data point in a visual, the tooltip will typically show the actual values of the fields associated with that data point.

This feature allows users to gain a clearer understanding of the specifics behind the data being visualized, making it easier to interpret the visual representation. By displaying the fields used, tooltips enhance the interactivity and usability of the visual, aiding in data exploration and analysis.

Although other options indicate different types of information that could potentially be shown in tooltips, by default, the tooltip focuses on the relevant fields, making it the standard behavior across various visualization tools.