A funnel chart is a visualization that resembles a funnel, primarily used to show conversion efficiency across stages in a business process. Its characteristics include:

• Narrow-down shape: The top represents the initial stage (e.g., potential users), the bottom represents the final stage (e.g., converted customers), with each stage's width proportional to its value.
• Process flow display: Stages are arranged in business logic order (e.g., "Exposure → Click → Inquiry → Order"), intuitively showing loss and retention at each step.
• Data annotation: Each stage is usually annotated with specific values and conversion rates (e.g., "Clicks 1000, conversion rate 20%"), facilitating quantitative analysis.