Well the first data structure that we studied is Linked List and it provides a way to implement various Advance Data Structures. It can be defined in the following way --
" A Linked List is a Data Structure that consists of a sequence of Data Records such that in each record there is a field that contains a reference or link to the next record in the sequence."
Above is the Singly Linked List in which each node has data and a link to the next node in the List. Head node is the start of the List. Next of the last node in the List is NULL.