Elements or values that appear more than once in a collection, such as an array or list.
Imagine you have a bag full of different colored marbles. If there are duplicate marbles in the bag, it means there are two or more marbles with the same color.
Unique Values/Elements: Elements that occur only once within a collection.
Frequency Counting/Hashing Technique: Methods used to count occurrences or track duplicates efficiently.
Set Data Structure: A collection that stores unique elements and does not allow duplicates.
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