How much is $1000 in Mexico US money?

Excuse me, I'm a bit confused about currency conversions. Could you please clarify for me: when someone mentions $1000 in Mexico, are they referring to Mexican pesos or US dollars? And if they're talking about converting $1000 USD to the equivalent in Mexican pesos, what would be the approximate amount based on current exchange rates? I'm trying to understand the financial implications of such a transaction and it would be greatly appreciated if you could provide some insight.