You are the brand manager for Yasso yogurt ice cream bars. You have just launched a new format of your product called "poppables," which allows consumers to eat smaller servings.

You realize that some of the sales volume for the new product will be the result of the cannibalization of the existing Yasso bar. Your sales estimate for the first year for Poppables is 1 million boxes and you estimate a cannibalization rate of 20%.

Please explain what the cannibalization rate represents (one sentence is enough) and calculate the cannibalized volume in this scenario.