If its not a priority queue, its a trie
They are pronounced like Tree (its named after Re"trie"val Tree). So its a Trie tree (but people keep calling them try trees / prefix / digital tree)! These happen SO frequently in interviews, its outstanding! For the sake of being practical, lets go over them.
The trie
The easiest way to visualize a trie is to think of auto-complete. Lets go over it on the whiteboard!
Lets not implement one!
I like using the whiteboard from time to time because i don't have to prove that I write amazing code all the time.