A priority queue differs from a regular queue in that things are ordered by their priority level. everything in a priority queue is more important than the things in a regular queue. you have to #include things are ordered by the programmer through the use of an iterator. Queues are mostly frequently used for applications where there is a need to rearrange the data frequent by. there is too much data to fit into a list. there Is a shared resource and there are multiple entities that need to use that resource. there are calculators calculators. A queue is a---data structure. FIFO FISO LIFO FIDO