Can you name data types that can be modified after creation?

Data types that can be modified after creation are called mutable. They include:

• In object-oriented programming languages — objects, arrays, lists, dictionaries (e.g., in Python, JavaScript).
• In JavaScript: objects, arrays, functions.
• In Python: lists (list), sets (set), dictionaries (dict).

Example in JavaScript:

const arr = [1, 2, 3];
arr.push(4); // array has changed

Example in Python:

my_list = [1, 2, 3]
my_list.append(4)  # list has changed

Unlike them, immutable types — strings, numbers, tuples (in Python), primitives in JavaScript — cannot be changed after creation, only a new object with modified data can be created.