This is a comparative segmented bar chart that displays everything in proportions of the full amount (100%) for the 3 sets of data points spread out over the corresponding 3 days.
For example, if we look at the bottom part of the left chart - the segment that is colored blue -- we'll see that 60% of the Day 1 shoppers "did not make a purchase and did not revisit that week."
Likewise, you can see that the remaining 40% of the Day 1 shoppers either "did not make a purchase, but revisited the site the next day" or they "purchased a different item, and did not revisit the site."
The 100% implies that those are the only 3 choices available.
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