Bar charts are good for when you want to show the difference between different categories. You can also use them to track changes over time. If you're looking to show how something is trending over time, a line graph is a better option. Bar charts work best if the changes over time are large. You can put them in reports to show how much revenue has changed throughout the year, or you can put them in an infographic to compare two groups of people. With Piktocharts bar graph maker, the data visualization possibilities are endless.