Explain what a data structure that combines multiple elements into a single immutable sequence is.

In Python, a data structure that combines multiple elements into a single immutable sequence is called a tuple. Tuples are similar to lists, but unlike lists, they cannot be changed after creation — this ensures immutability.

Example of a tuple:

my_tuple = (1, 2, 3, 'a', 'b')
print(my_tuple[0])  # Will output 1

Tuples are useful when you need to guarantee that data will not be modified, for example, as keys in dictionaries or for passing fixed sets of values.