In the context of data, a default anything (default address, default credit card, etc.) is the one to use if nothing else is specified. 

  • By selecting an address as default on your account, that will be the address used for shipping on your orders unless you choose or enter a different one. 
  • By selecting a credit card as default on your account, that card will be used when placing orders unless you choose or enter a different one.
Did this answer your question?