Alright
Let me use web pages to illustrate the difference.
You know our browsers show us the pages we visited last and the frequently visited sites.
In LFU, the page with the least visit within a given period of time is removed.
In the LRU, I think this is when queue operation comes in but not exactly FIFO because when there is a repetition the first isn’t exactly evicted the repeated page is just seen as the most recent.
Basically from my all my reads and research LRU are used for small caches, LFU are mostly used for robust caches
Honestly wish I could use a VN for this 😂 I just hope you understood the whole idea, and if I am not right please feel free to drop your thoughts.