Advantage of Sentinel node

The most significant advantage of using the sentinel nodes in the doubly linked list:

• By adding the sentinel nodes to the doubly linked list now for the deletion or insertion at the beginning, end or in between the beginning and end nodes of the linked list, we do not need to write the different conditions for each one. 
• All these operations can be done as the deletion or insertion between the beginning and end node of a doubly linked list.

In the case of the simple doubly linked list, if we have to perform the insertion or deletion operation at the starting of the doubly linked list, end of the doubly linked list, or in between the starting and end nodes for each, we require to check different condition that makes the algorithm complex so to solve this problem we can use doubly linked list along with the sentinel nodes.