An ambassador, a diplomat who represents her own country in a foreign country, lives and works in an embassy.
Travelers sometimes visit their home country's embassy for help with their travel documents or other issues. If you've ever visited Washington, DC, you may have seen the French embassy or the Indian embassy. These buildings often resemble homes, which makes sense because ambassadors usually live in them. The word embassy first meant "job or position of the ambassador," and comes from the Old French ambasse, with its Latin root of ambactus, or "servant."