This works both ways, if you hold a US license and you're driving in another country, you may need it translated as well. Requirements vary by country, but Italy is a useful example of how it typically works for non-EU/EEA visitors.
Common-Law Countries, the UK, Canada, Australia, Ireland, accept a certified translation, the same standard the US uses: a complete, accurate translation with a signed statement of accuracy. There's no government-appointed translator requirement.
Civil-Law Countries, Italy, France, Germany, Spain and most of continental Europe, require a sworn translation, produced by a translator officially registered with a court. A certified translation alone isn't enough there; it has to carry that sworn status to be accepted.
Italy is a useful worked example. EU and EEA license holders don't need any translation there. If you hold a license from outside the EU/EEA, including the US, Canada, Australia or New Zealand, Italian law requires you to carry either an International Driving Permit (IDP) or an official sworn translation alongside the original, neither one is valid on its own. The sworn translation route has a real advantage over the IDP, an IDP has to be obtained before you leave home, but a sworn translation can still be arranged if you're already in Italy and realize you don't have one. Most rental companies there will ask to see one or the other before handing over the keys.
If you're heading to Italy or another country and need your US license translated, certified or sworn, depending on the destination, we handle both.