A chart is a tool for explaining it. The table gives facts an figures. The chart clarifies and emphasizes key relationships in the figures. Top of Page Keep the chart or table simple The simplest charts are bar charts and pie charts. Research indicates that these kinds of charts are the easiest for viewers to follow.
Line charts are more difficult, but they can be effective, too.
Try to highlight just the key information in your chart. Clutter detracts from your audience's understanding of the key points. Use simple, non-technical headings. Be accurate . Improperly designed visuals can distort, rather than clarify, key relationships.