The plot area in Excel is a part of a chart or graph that contains the data markers, gridlines, data labels, trendlines, and optional chart items placed in the chart area). It is the area where the chart data is plotted). The plot area is surrounded by the chart area, which contains the axes, the chart title, the axis titles, and the legend). The plot area is where you can format the background of the chart. You can change the color, border, and other formatting options of the plot area to make it look different. The plot area is an essential part of creating an area chart in Excel, which is a line chart where the area below the line is filled with a color. The area chart is useful when you have different time-series data and need to showcase the relation of each set to the complete data.