What is the purpose of custom tooltips in Microsoft Power BI?

Custom tooltips in Microsoft Power BI are used to enhance user engagement by providing interactive insights. When users hover over a data point in a visual, a custom tooltip appears, displaying additional context and detailed information relevant to that specific data point. This functionality is particularly valuable because it enables users to gain deeper insights without cluttering the main visuals on a report page.

Additionally, it allows for the inclusion of different visuals within the tooltip—like charts or tables—that can summarize or provide further analysis of the hovered data point. This personalized interaction not only helps in understanding complex data but also engages users, making their analytical experience richer and more informative.

The other options do not accurately describe the purpose of custom tooltips; they do not connect to multiple data sources simultaneously, replace automatic updates of report data, or primarily focus on the aesthetic appeal of the visuals.