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Web Development Intermediate

What is Caching?

Storing copies of frequently accessed data in faster storage to reduce load times and server processing.

Caching stores computed results or fetched data for quick reuse. Types include browser cache (assets), CDN cache (edge content), application cache (computed data in Redis/Memcached), and database cache (query results).

Cache headers (Cache-Control, ETag, Last-Modified) control browser caching. Cache invalidation — knowing when to update cached data — is famously one of the hardest problems in computer science.

Related Terms

Idempotency
A property where performing an operation multiple times produces the same result as performing it once.
Cookie
A small piece of data stored in the browser by a website to remember user preferences, login state, or tracking information.
Progressive Web App (PWA)
A web application that uses modern web capabilities to deliver app-like experiences with offline support and push notifications.
SEO (Search Engine Optimization)
The practice of optimizing websites to rank higher in search engine results, increasing organic traffic.
Canonical URL
An HTML element that tells search engines which URL is the preferred version of a page when duplicate or similar content exists at multiple URLs.
SSR (Server-Side Rendering)
A technique where web pages are rendered on the server and sent as complete HTML to the browser, improving SEO and initial load time.
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