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In class today we learned about waterfalls in HTTP. What water falls are is a chart is any diagram that represents data that is generated cumulatively and sequentially across a process. 
There are different waterfalls. One of those is called a  "performance-specific waterfall chart lets you see the series of actions that occur between a user and your server in order for that user to view a specific individual page of your site." You should be check your waterfall if you care about the way the webpage you are in loads. So you have a better understanding of why a page may take longer to load than others.

source: https://blog.radware.com/applicationdelivery/wpo/2014/03/waterfalls-101-how-to-use-a-waterfall-chart-to-diagnose-performance-pains/



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