Application of queue in data structure?

Application of stack:

• It is used in various expression conversion and evaluation - infix to post-fix or prefix evaluation.
• Stack is implicitly used by system while calling to sub routines function from main program.
• Recursion

Application of queue:

• Used by operating system in scheduling jobs and spooling (queue of print jobs)
• Disk I/O calls
• Queue is also part of the architecture of processors ex- 80386,8086