What does the head of a linked list contain?

The head of a linked list contains the first node or element in the list. This node holds two pieces of information:

1. The data: This is the actual value or information that the node is storing. It can be of any type (integer, string, object, etc.) depending on the implementation of the linked list.

2. The reference (or link) to the next node: This is a pointer that points to the next node in the linked list. If the current node is the last node in the list, this pointer usually points to null, indicating the end of the list.

So, in summary, the head of a linked list contains the first node, which in turn contains the data and a reference to the next node in the list.