Why there is a difference between the size of apps?

I

iMore Question

Hi;
My question is about the difference of the size of apps originally installed and the size I see in the settings.
I will explain.
For example shazam the app wich recognizes songs weights 70 mb; in the settings zone where is the list of apps installed in my Ipad; it's size there is 250 mb.
I suppose this is because the information it stores in the iPad ; but how can I erase this information?
How can I delete stored information and make more space in iPad?

Thank you very much; aharon.
 

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