Animate LFU cache replacement with live frequency counters. See how the least frequently used item is evicted when the cache is full.
Least Frequently Used evicts the item that has been accessed the fewest times. Frequency is a proxy for long-term importance.
When multiple items share the lowest frequency, LFU breaks ties by evicting the least recently used among them (LFU + LRU fallback).
CDN caching, database buffer pools, and any scenario where popularity over time matters more than recency.