The list is an Data structure similar to an array. It is mutable, meaning that the same list object can be changed.

The key difference is that tuples are immutable. This means that you cannot change the values in a tuple once you have created it. This is a good feature to have in some data structures where you intend to not make any changes to certain parts. As a list is mutable, it can't be used as a key in a dictionary because dictionaries can use any immutable object as a key. Thus, tuples can be used as dictionary keys if needed. If you try to modify a tuple in a permitted way it becomes two Tuples: the original, which remains fo every scope other than yours, and your modified copy for your scope.