Cache-aside, write-through, write-behind, and eviction policies — reduce latency and load with the right caching strategy.
Five passes over the same idea, each from a different angle. Do them in order, or jump to whichever you need.
Caching stores frequently accessed data closer to the consumer. Strategies differ in write/read consistency guarantees. Eviction policies (LRU, LFU, TTL) control memory usage. Cache invalidation is famously the hardest problem. Multi-layer caching (browser → CDN → application → database) compounds benefits.
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