Explain the differences between data structures List, Set, and Map in terms of their usage and characteristics.

List, Set, and Map are different data structures with different characteristics and applications:

• List is an ordered list of elements, allowing duplicates. It is used when the order of elements is important and duplicates are allowed.

• Set is an unordered collection of unique elements, duplicates are not allowed. It is suitable for quick search and existence checks.

• Map is a collection of key-value pairs, where keys are unique. It is used for associative data storage, allowing quick retrieval of values by key.

Example in Dart (Flutter):

List<int> numbers = [1, 2, 2, 3]; // allows duplicates
Set<int> uniqueNumbers = {1, 2, 2, 3}; // will contain {1, 2, 3}
Map<String, int> ages = {'Alice': 30, 'Bob': 25};