plug adapter

https://www.worldstandards.eu/electricity/plug-voltage-by-country/

Yes. They use the same plugs (rounded two-prong) as most of Europe.

Yes, the same one for most of Europe, exception being the UK which has a different one.

Depends if it's a 2-pin or a 3-pin plug.
2-pin plugs (so-called Europlugs) are the same in Switzerland, Italy and everywhere else in mainland Europe (but not the UK or Ireland).
3-pin plugs are more complicated. Switzerland is different from Italy, and both are different from the "Schuko" plugs used elsewhere in mainland Europe.

Thanks for this question - I had the same one this morning but hadn't had time to research.

Yes. They use the same plugs (rounded two-prong) as most of Europe.

The "rounded two-prong", type C plug is limited by codes in Europe to 1) less than 2½ amps (575W), to 2) non-grounding US plugs (no third rounded prong), and to 3) non-polarizing US plugs (both blades equal width). It's fine for low wattage devices like computer and phone chargers, but unless your appliance draws less than 2½ Amps and has 2 equal width, flat blades only, you should not use the "rounded two-prong", type C plug. You will not be "to code".

Thank you for the info.