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Line charts, area charts, and scatter plots are the most effective visual types for displaying time-based trends in Power BI because they clearly represent data points over a continuous timeline, allowing users to easily identify patterns, trends, and changes over time.

Line charts are particularly well-suited for this purpose because they connect individual data points with lines, effectively highlighting trends in the data across a specified time period. Area charts build on this by filling the area under the line, providing a visual representation of volume and making it easier to see the magnitude of trends over time.

Scatter plots also serve a unique role in this context as they can display the relationship between two time-based variables, offering insights into trends by visualizing how one variable may influence or correlate with another over the same period.

In contrast, bar charts and pie charts are more effective for showing categorical comparisons rather than trends over time. Tables and matrices present data in a structured format but do not convey trends effectively. Similarly, cards and KPI indicators provide snapshots of key metrics and are useful for summarizing information, but they lack the capacity to depict changes over time comprehensively. Thus, those visual types do not serve the objective of illustrating time-based trends as effectively as line charts, area charts, and scatter