In what situations is it optimal to use data structures like lists?

Lists in Python are optimal when you need to store an ordered collection of elements with the ability to dynamically change size. They are convenient for cases where:

• Frequent access to elements by index.
• Adding or removing elements at the end of the list (append and pop operations are efficient).
• Iterating over elements in the order they were added.

However, for frequent insertions or deletions in the middle of the list, other structures should be considered, as lists require shifting elements. For example, for queues, it's better to use collections.deque.

Example of using a list:

fruits = ['apple', 'banana', 'cherry']
fruits.append('orange')  # adding an element
print(fruits[1])  # access by index