how is Vatican City different from all other European countries?

it is located entirely inside another country.
it is a theocracy
it has a catholic majority
it does not use the euro

Vatican City is different from all other European countries in several ways, including:

1. Size: Vatican City is the smallest country in the world by both population and land area.

2. Government: Vatican City is an absolute elective monarchy and an ecclesiastical state ruled by the Bishop of Rome, who is also the Pope.

3. Religion: The majority of Vatican City's population practices Roman Catholicism, and it is the center of the Catholic Church.

4. Currency: Vatican City does not use the euro as its official currency. Instead, it uses the Vatican City State euro, which is only valid within its territory.

5. Independence: Vatican City is an independent city-state with its own laws, government, and police force, separate from Italy where it is located entirely within the city of Rome.