In Power BI, what type of chart is best suited for showing trends over time?

A line chart is the most effective choice for showcasing trends over time because it emphasizes the continuity and progression of data points across a time axis. This type of chart allows for the visualization of data at regular intervals, making it easy to identify patterns, fluctuations, and movements over specific periods. Line charts inherently connect data points with straight lines, which visually represents changes and trends with clarity.

In contrast, pie charts are designed to show proportions and are not suitable for illustrating data trends over time. They focus on the part-to-whole relationships within a single data snapshot rather than the changes across multiple time points. Column charts can track changes over time as well, but they primarily use vertical bars to compare different categories rather than illustrating a continuous flow of time. While tables provide a detailed data overview, they do not possess the graphical capabilities to demonstrate trends, making them less effective for this particular use case.