Socialism means a world society based on production solely for use, not profit.
It will be a classless society, in which everyone will be able to participate democratically in decisions about the use of the world's resources, each producing according to their ability and each taking from the common store according to their needs.
In such a society there can be no money
--or, more precisely, no need for money. Money is only needed when people possess and most do not.
Imagine that all the things you need are owned and held in common.
There is no need to buy food from anyone--it is common property. There are no rent or mortgages to pay because land and buildings belong to all of us. There is no need to buy anything from any other person because society has done away with the absurd division between the owning minority (the capitalists) and the non-owning majority (the workers).