What is the difference between array and set in swift

Answer 1

This doesn't necessarily conform to Swift but to all languages, array is like a list containing multiple values while set is like an array, but it contains ONE instance of any value.
Examples:
Array
{1, 2, 1, 3} has two 1's
Set
{1, 2, 3} can only have one 1

Answer 2

That's all differences?

Answer 3

Sets in Swift are unordered