STACK follows LIFO. Thus the item that is first enetered would be the last removed.

In array the items can be entered or removed in any order. Basically each member access is done using index. No strict order is to be followed here to remove a particular element.

Array is a linear Data Structure in which insertion and deletion can take place in any position. The elements can be retrieved randomly in Arrays.

Stack is also a linear data structure in which insertion and deletion will take place at the top position alone. It follows LIFO order i.e. last in first out. The element in the top most position alone can be retrieved.