An infographic is a visual representation of information or data. They can be beautiful or confusing.
For examples of infographics or infographics to use (and cite!) in your argument, try these sites:
Information is Beautiful
Infogram requires a free account, but it's easy to use and will save the images. It even does the math for you!
You make make infographics and charts, and there are several designs to choose from.
Canva is easy to use and creates many designs -- infographics, slideshows, posters, and even Facebook covers!
It, too, requires a free account. It's really easy to use and has many options for designs.