okie.. paypal is a middle man.
since u are buying something from taiwan off the auction, the
seller will bill u using paypal asking for the payment with the
description of goods. then, with this bill, u can transfer $ to
paypal using your credit/debit cards. is this most effective as if
u send cash or even cheque to your seller through mail, it will
take a longer time. usually seller will request 5% more from the
final price bcos if they are to withdraw the $ from paypal, they
have are charge 5% of the amt they are withdrawing.. so this 5%
would normally be charged under the buyer.
i hope this helps =)
u can pm me if u need further explanation. i used paypal quite
often