What is a "billing address"?

im buying sm stuff online, & it requires the shipping address & billing address..what do they use the billing address 4? do they like charge anything on it? cz the method of payment is credit card, & i entered the credit card info...plz help
Update: no the shipping address isnt the same as the billing address in my case, my home is overseas, & im visiting at my aunts here in the US, & using my dad's card 2 purchase something 4 him which i want 2 b shipped 2 my aunts home
Update 2: & what if the website wont accept other than US addresses? shall i just enter my aunt's address?
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