How much is $1 U.S. dollar?

Excuse me, could you please clarify for me the value of one U.S. dollar in the current market? I understand that exchange rates can fluctuate, but I'm just trying to get a general sense of how much one dollar is worth in comparison to other currencies. Is there a specific exchange rate that I should be aware of, or does it vary depending on the specific context? I'm hoping to make an informed decision regarding a financial transaction, so I'd appreciate any insight you could provide. Thank you.