A scatterplot, or an XY chart, measures two different variables along the dimensions of the chart, and data points are plotted along those axes where they belong. Sometimes the pattern of plot points indicates a positive or negative correlation, and sometimes it indicates that there is no relationship between the two variables. Still, scatterplots sort and classify data points. And internet humorists love to sort, classify, and list things. See some of the funnier ones in a list I posted at mental_floss.
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