What is the difference between creating a new solidity contract with and without the new keyword

Question

What is the use of the new keyword for creating new smart contracts. Why not just omit this keyword?

Answer 1

You cannot omit new keyword for creating new contracts.

In the case of: token = new Token;

a new contrast is created and the address passed to token.

In the case of: token = existingToken;

existingToken has to be an existing contract (already created) and token will be passed the current address of existingToken.