A line graph connects individual data points that reflect numerical values. It is used to visualize the relationship between dependent and independent variables.

A number line is a useful way of showing the order of numbers and can help you compare and estimate the value of numbers. The arrow on this number line is between 60 and 70.

Here's the story of income inequality in America over the past 40 years. Hover over each line to identify household income, and click through to see the percentage growth over the past 40 years.

This chart captures the rise in inequality better than any other chart that I’ve seen.