How do you enhance data visualizations with "tooltips" in Power BI?

Enhancing data visualizations with tooltips in Power BI primarily involves providing additional contextual information when a user hovers over a data point. Tooltips are designed to improve user understanding by displaying relevant details associated with that specific data point, such as numerical values, descriptions, or any other additional metrics that are not immediately visible in the main visualization.

This feature allows users to interact more effectively with the data, gaining insights without cluttering the visual with excessive information. Tooltips are customizable, meaning users can tailor what information they want to show based on different criteria, enhancing the overall user experience.

Other options do not align with the function of tooltips. While adding external links could provide additional resources, it does not pertain to the interactive, contextual nature that tooltips serve. Redesigning the visual completely changes its fundamental representation, which is not the purpose of utilizing tooltips. Displaying only aggregate values might simplify the information but doesn’t provide the nuanced context that tooltips are intended to offer. Thus, the correct answer emphasizes the interactive and informative nature of tooltips as an enhancement to data visualizations in Power BI.