In Round robbbin , a queue is maintained which stores the input as it comes in FIFO order
Its different from FIFO because of pre emption
When does premption occur
a time quantum is allocated( a specific time say 10 sec for a process, then even if the process is not completed, the next process in queue enters for execution and the remainingg of this executed process is also added in the queue
so the process enters in FIFO with premption
ANSWER = FIFO