A PriorityQueue is a list that always keeps its items sorted based on some rule, like smallest to largest. So, when you take an item out, you always get the one with the highest (or lowest) priority.

Such a stack data structure may eventually be embedded in an in vivo context to store messenger RNAs and reverse the temporal order of a translational response, among other applications.

Data comes in many shapes and forms (obviously), but two of its core ‘structures’ are stacks and queues. Data elements in a stack and a queue differ by virtue of their order.