Consider the data on the number of COVID-19 cases in different countries. Suppose one wants to know the country with the highest or lowest number of COVID patients. In that case, they can use the Pareto chart to visualize the given data. A Pareto chart is a modified bar graph. In this chart, the bars are arranged in descending order from left to right. Here, the categories, that is, the different countries, are featured on the horizontal axis. The frequencies are represented on the vertical axis. A bar above each category indicates the frequencies of COVID patients for each country. From the chart, it can be seen that country E has the highest number of COVID patients, and country F has the lowest number of patients. Pareto charts are thus a useful tool to visualize large data sets.