Cache is a temporary storage layer that stores copies of data or computations so future requests for that data can be served faster. Key Characteristics Fast Access: Cache is usually located closer to the processor (e.g., CPU cache, memory cache) or within faster storage (e.g., in-memory).Temporary: Data in cache is not permanent and can be cleared or expire.Reduces Latency: Cache reduces the need to access slower storage (like a database or disk). Common Types of Cache Type Description Example CPU Cache Built into processor (L1, L2, L3) for fast data access Speeds up access to frequently used instructions Memory Cache Uses RAM to store frequently accessed data Web browsers store pages in RAM Disk Cache Stores data on disk for quicker access Operating system caches disk I/O Web/Browser Cache Stores static assets like CSS/JS/images Prevents re-downloading resources Application Cache Cached database queries or API responses ASP.NET, Django, etc., use caching CDN Cache Caches content at network edges Speeds up delivery of images/videos Example in Web Development A web page loads a user's profile: Without Cache: Server fetches data from the database every time → slower.With Cache: Server stores user data in memory and serves it directly on next request → much faster. Cache Invalidation This means removing or updating stale cache. It's critical because: Cached data can become outdated.Needs clear rules: e.g., time-based expiry, manual refresh. Summary Cache is like a shortcut that avoids doing the same work repeatedly. It boosts performance at the cost of using more memory/storage and the need to manage data freshness.

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What is Cache?

ICSM Computer 559 03 Aug 2025

Ask by ICSM Computer

Updated 03 Aug 2025

1 Answers

ICSM Computer 03 Aug 2025

Cache is a temporary storage layer that stores copies of data or computations so future requests for that data can be served faster.

Key Characteristics

Fast Access: Cache is usually located closer to the processor (e.g., CPU cache, memory cache) or within faster storage (e.g., in-memory).
Temporary: Data in cache is not permanent and can be cleared or expire.
Reduces Latency: Cache reduces the need to access slower storage (like a database or disk).

Common Types of Cache

Type	Description	Example
CPU Cache	Built into processor (L1, L2, L3) for fast data access	Speeds up access to frequently used instructions
Memory Cache	Uses RAM to store frequently accessed data	Web browsers store pages in RAM
Disk Cache	Stores data on disk for quicker access	Operating system caches disk I/O
Web/Browser Cache	Stores static assets like CSS/JS/images	Prevents re-downloading resources
Application Cache	Cached database queries or API responses	ASP.NET, Django, etc., use caching
CDN Cache	Caches content at network edges	Speeds up delivery of images/videos

Example in Web Development

A web page loads a user's profile:

Without Cache: Server fetches data from the database every time → slower.
With Cache: Server stores user data in memory and serves it directly on next request → much faster.

Cache Invalidation

This means removing or updating stale cache. It's critical because:

Cached data can become outdated.
Needs clear rules: e.g., time-based expiry, manual refresh.

Summary

Cache is like a shortcut that avoids doing the same work repeatedly. It boosts performance at the cost of using more memory/storage and the need to manage data freshness.

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