continental Europe. France, Germany, etc. Not Europe including UK, Ireland is a different plug. I commonly cross between the US, Europe, UK plugs so carry a USA powercore and a Europe adaptor and UK adaptor and it works in all that corner of the world.
Those who do not travel much may think Europe includes UK and Ireland, these are part currently of the European Union but those organizations existed after the electrical system had evolved, UK made their own, Ireland copied it, and France and Germany went their own way.
So to work in France then a simple cheap plug adapter like this:
For UK / Ireland then