In simple terms, a HashSet is a collection of unique elements where duplicates are not allowed. Imagine a party guest list where each person’s name appears only once—no duplicates! That’s exactly how a HashSet works in programming. It ensures that every element in the set is unique, making it an efficient choice for fast lookups, insertions, and deletions.

Core Characteristics of HashSets

✅ Uniqueness: A HashSet ensures that every element is unique. If you try adding a duplicate, it simply gets ignored