In a doubly linked list, also called as 2 way list, each node is divided into 3 parts.
The first part is called previous pointer field. It contains the address of the preceding elements in the list. The second part contains the information of the element and the third part is called next pointer field. It contains the address of the succeeding elements in the list. In addition 2 pointer variable HEAD and TAIL are used that contains the address of the 1st element or the address of the last element of the list. Doubly linked list can be traversed in both directions.