Why am I being charged a credit card fee?

Could you please explain to me why I'm being charged a credit card fee for my cryptocurrency transaction? I understand that there are often fees associated with financial transactions, but I'm curious about the specifics behind this particular charge. Is it a standard fee for all transactions or is it specific to my card or the cryptocurrency I'm buying? Additionally, are there any ways to avoid or minimize this fee in the future? I appreciate your help in clarifying this matter.