Difference Between circular queue and simple queue

[UsamaFarooq]

Hi Everyone, is there is any body who can tell me basic difference between circular and simple queue with the help of diagram. thanks in advance

[kbw]

The difference is in the implementation. A queue is a queue, a FIFO structure.

The difference is in how the queue is implemented. You could imagine a queue being implemented using a linked list, but what you call a circular queue is implemented using a circular buffer.
https://en.wikipedia.org/wiki/Circular_buffer
http://www.brucemerry.org.za/manual/structures/circular.html