Which chart type is commonly used to show trends over time?

• A. Column Chart
• B. Bar Chart
• C. Line Chart
• D. Pie Chart

Answer: (C)

Showing how values change over time is best captured by a line chart. In a line chart, time is typically on the horizontal axis and the measured value on the vertical axis, with a line that connects each data point in sequence. This setup makes the direction and rate of change easy to see, so you can spot upward or downward trends, plateaus, and fluctuations at a glance. It’s especially useful for monitoring things like stock prices, temperatures, or website visits over days, weeks, or years because the continuous connection between points conveys the progression over time.

Column and bar charts, on the other hand, are great for comparing amounts at specific moments or across categories, but they show snapshots rather than a continuous trend. Pie charts display how a whole is divided at a single point in time, not how values evolve over a period.

So, for illustrating trends over time, the line chart is the most effective choice.