How much is $1.00 US in pesos?

Could you please elaborate on the current exchange rate between the United States Dollar (USD) and the Mexican Peso (MXN)? Specifically, I'm interested in knowing how much one US Dollar ($1.00) would be equivalent to in Mexican Pesos. The exchange rate can fluctuate depending on various economic factors, so it's important to stay updated with the latest information. Is there a reliable source where I can find the most recent exchange rate? Additionally, could you provide a brief explanation of how exchange rates are determined and how they impact cross-border transactions?