ELI5 National Debt - who do countries owe when they are in debt?

Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast by ELI5 Explain Like I'm Five Podcast

If every major country is in billions of debt, where are they borrowing from? Who exactly do they owe? Are there any consequences for them being in debt? Why is it a problem when it gets large? Why was Greece in trouble,...View more