Which method adds an element to the end of a list in Python?

The method that adds an element to the end of a list in Python is 'append()'. When you use this function, you are effectively instructing Python to take the item you specify and place it at the last position of the list. This is a straightforward and efficient way to build collections as you can continually add new elements without needing to specify an index.

The 'append()' method modifies the list in place and returns None, which means it does not create a new list but rather changes the existing one by adding the new element to its end. This makes it a commonly used method for constructing lists dynamically.

In contrast, the other options serve different purposes. The 'add()' method does not exist for Python lists; it is associated with sets. The 'insert()' method allows for inserting an element at a specified position in the list, while 'extend()' is used to add multiple elements from an iterable to the end of the list rather than a single element. Understanding these distinctions clarifies why 'append()' is the correct choice for adding a single element to the end of a list.