List-based:

• List<T> - Dynamic array
• LinkedList<T> - Doubly linked list
  Set-based:
• HashSet<T> - Unique elements, fast lookup
• SortedSet<T> - Sorted unique elements
  Dictionary-based:
• Dictionary<K,V> - Key-value pairs, fast lookup
• SortedDictionary<K,V> - Sorted key-value pairs
• ConcurrentDictionary<K,V> - Thread-safe dictionary
  Queue/Stack:
• Queue<T> - FIFO collection
• Stack<T> - LIFO collection