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Technical Vocabularynoun|verb · /kæʃ/

cache

In simple English

In tech workplaces, cache is one of the most fundamental concepts for optimizing application performance. When data is cached, it sits in a faster storage layer—like RAM, a dedicated cache server, or the browser—so the next time the same data is needed, it loads instantly instead of being retrieved from disk or a remote database. This is critical because accessing main memory is hundreds of times faster than fetching from disk, and fetching from a local cache is faster than making network requests. Teams use caching strategies constantly: browser caches store web pages and images, Redis or Memcached cache database query results, CDNs cache static content geographically, and CPU caches store frequently used instructions. Understanding cache invalidation—knowing when cached data becomes stale and needs refreshing—is a major challenge in software engineering. You will hear cache discussed in performance reviews, architecture decisions, and debugging sessions daily.

What is a cache in programming, and why is it important for application speed?

At a glanceCEFR B2
Commonness5/5
Versatility5/5
FormalityCasualFormalNeutral
Spoken ↔ WrittenSpokenWrittenBoth
Directness ↔ DiplomaticDirectDiplomaticDirect
RegionUS and UK
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Say it like this

✓We need to invalidate the cache after this update.
✓I am going to cache the database query results.
✓The cache hit rate is too low on this endpoint.

Real examples

in a standup

"We deployed a fix to cache user profiles so the dashboard loads faster."

in a code review

"Did you remember to clear the cache when the user updates their settings?"

in a team meeting

"Our cache layer is running out of memory, so we need to increase the instance size."

Don't say this

Handle with care. Do not confuse with 'cash' (money). Cache is about storing data for fast retrieval, not financial resources.

✕We will cash the results in memory.
✓We will cache the results in memory.— Cash means money; cache means stored data.
✕The cache is storing the wrong data because we do not clear it.
✓The cache is serving stale data because we do not invalidate it properly.— Cache data becomes stale, not wrong; you invalidate or clear it, not erase it manually.
✕We cached everything to make it faster.
✓We cached frequently accessed data to improve performance.— Caching everything wastes memory; cache only data that is accessed repeatedly.

Other forms

noun

cache

"The cache stores the most recent user queries."

verb

cache

"We cache the API response for 5 minutes."

verb (past tense)

cached

"The homepage was cached by the browser."

noun (action)

caching

"Caching is essential for reducing database load."

Often used with

cache invalidationRemoving or updating cached data when the source data changes. Example: 'Cache invalidation is one of the hardest problems in computer science.'
cache hitWhen the requested data is found in the cache. Example: 'The cache hit rate increased after optimization.'
cache missWhen the requested data is not in the cache, requiring a slower fetch. Example: 'Each cache miss adds 200ms to the request.'
clear the cacheTo remove all cached data. Example: 'Clear the cache if users report seeing outdated information.'
cache layerThe storage system that holds cached data. Example: 'Redis serves as our cache layer.'
distributed cacheA cache shared across multiple servers. Example: 'We use a distributed cache to handle millions of requests.'

Similar words

bufferA temporary storage area, but buffer is more general; cache specifically optimizes speed.
memory storeRefers to data stored in fast memory; less technical than cache.
lookup tablePre-computed data stored for quick reference; more specialized than cache.

Opposites

source of truthdatabase

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Practice

Try it

4 quick exercises

Pick the most natural phrasing

1. Your database queries are slow. What is the best fix to say at work?

Complete the sentence

2. We need to _______ the homepage so it loads instantly for returning users.

Spot the mistake

3. Which sentence uses cache incorrectly?

Rewrite naturally

4. Rewrite this sentence using cache: 'We store the product list in fast memory so it loads quickly.'

Questions

Quick poll

Have you said "cache" in a standup this week?

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