What is the main function of the Set data structure and what is its advantage?

A Set is a data structure that stores unique elements without a specific order (in the case of HashSet) or with a specific order (for example, TreeSet).

The main function of a Set is to guarantee that each element appears only once. This is useful when you need to eliminate duplicates or check for the presence of an element.

Advantages:

• Fast search, addition, and removal of elements (approximately O(1) in HashSet)
• Guarantee of element uniqueness

Example of use: storing unique user IDs, filtering out duplicate values from a list.