Caching stores frequently-used data in fast memory so you don't hit the slow database every time. Cache HIT = fast (<1ms). Cache MISS = slow (50ms). Most systems aim for 95%+ hit rate.

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High-Level Design0/247

What is Caching?

Read-Through vs Write-Through Cache

Caching Strategies

Cache Eviction Policies

Distributed Caching

Content Delivery Network (CDN)

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mediumPhase 5 · Caching & CDN 5 min read

Distributed Caching

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Interactive — Try it yourself!

Practice in Simulator

Build this system step-by-step with interactive choices

How to use

1Click "Send Request" to fetch data

2Watch: Cache checks if data exists (HIT) or fetches from DB (MISS)

3Turn on "Auto" mode to see continuous requests

4Click "Kill Cache" — now ALL requests go to DB (slow!)

In a nutshell

Caching stores frequently-used data in fast memory so you don't hit the slow database every time. Cache HIT = fast (<1ms). Cache MISS = slow (50ms). Most systems aim for 95%+ hit rate.

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