Share your insights or perspective on the financial matter presented in the input.

If a country can just print money, is global debt between countries real? 
The debt is absolutely real. China loans money to US via buying the US treasury bonds. The bond is essentially a promise to pay back the money with interest, just like a loan. As you point out, the US can print money. If this were to happen, then the USD that the owner of a treasury bond receives when the bond matures are worth less that than the USD used to purchase the bonds. There are lots of reasons why the US doesn't want to print lots of money, so the purchaser of the bond is probably confident it won't happen. If for some reason they think it is possible, then they will want to cover that risk by only purchasing bonds that have a higher interest rate. The higher interest offsets the risk of the USD being worth less. Of course, there are lots more details, e.g., the bonds themselves are bought and sold before maturity, but this is the basic idea.