In the context of linked lists, what is the purpose of the 'dummy node'?

A dummy node, also known as a sentinel node, is a technique used in linked lists to simplify the code. Here are the steps to explain its purpose:

1. Simplification of Code: The primary purpose of a dummy node is to simplify the code, especially when dealing with edge cases. For example, in operations like insertion and deletion at the beginning of the list, having a dummy node can help in handling these cases more efficiently.

2. Placeholder: A dummy node acts as a placeholder and is usually placed at the beginning of the list. It does not hold any actual data. Its 'next' pointer points to the head of the list. This way, the dummy node serves as a reference to the head of the list, making it easier to perform operations without losing the reference to the start of the list.

3. Handling Empty Lists: A dummy node can be particularly useful when dealing with empty lists. Since it doesn't hold any actual data, it can be used to represent an empty list. This way, we don't have to write separate code to handle operations on an empty list.

4. Consistency: With a dummy node, every element in the list has a node before it, which brings consistency while writing code for operations like insertion and deletion.

In conclusion, the purpose of a dummy node in a linked list is to simplify the code, provide a consistent way to handle edge cases, and make operations on the list more efficient.