A SortedSet is a collection type in programming that stores unique elements in a specific order. Unlike regular sets, which do not guarantee any order, a SortedSet automatically arranges its items based on their natural ordering or a specified comparator. This makes it easy to retrieve elements in a sorted manner. SortedSets are commonly used in various programming languages, such as Java and C#. They are particularly useful for tasks that require frequent searching, adding, or removing of elements while maintaining order, making them efficient for operations like range queries and ordered traversals.