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The set() function in Python is used to create a collection of unique, unordered items. Sets are similar to lists and dictionaries but only hold unique elements, meaning no duplicates are allowed. They are highly useful for cases where you need to ensure that each item is distinct and perform mathematical set operations like unions, intersections, and differences.

Key Characteristics​

• Unordered: Items have no specific order, so indexing and slicing aren’t supported.
• Mutable: You can add and remove items, but only hashable (immutable) types like numbers and strings can be added to a set.