What's the difference between an array and a set in Appian?

When looking at the list of available functions I see there is a list for array and one for set. I've been working with appian for a bit but I seem to use both list of functions for any array type, whether it is a list of CDTs or a list of numbers.

So, could someone explain to me what the set data type is and how it differs from an array?

If it's been asked already please send me a link. I was unable to find an answer for this when searching the site.

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