What are the Differences between array and queue?

from the abstraction: list

you go to the implementation details (concrete):

arraylist,vector or linkedlist,circularlinkedlist and maybe more

when somebody asks you for a special list in this case (queue)

speciality 1 enqueue -add to botton

speciality 2 dequeue - remove from top

you are free to pick up arraylist,and/or linkedlist and/or circularlists and/or vector to implement your new specialized list called queue.

and/or means you might want to combine as well