Linked List :
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it is a group of nodes
each node contains data element and next node address

if i am pointing to a particular , i am holding the address of the particular location

How Many types of linkedlist :
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Singly linked list  (Unidirectional)
Circular Singly linked list (Bi directional)
Doubly linked list (Unidirectional)
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Array vs Linked List: the same applied to Array Vs ArrayList
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Array has static size;
Linked list is having dynamic size
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ArrayList vs LinkedList
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By using linked list we have a greater advantage 
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