 The 'tail' of a list may refer either to the rest of the list after the head, or to the last node in the list.In Lisp and some derived languages, the next node may be called the 'cdr' (pronounced "could-er") of the list, while the payload of the head node may be called the 'car'.Singly linked lists contain nodes which have a data field as well as 'next' field, which points to the next node in line of nodes.