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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

HTTP/3
The latest HTTP version that uses QUIC instead of TCP, providing faster connections and better performance on unreliable networks.
SPA (Single Page Application)
A web application that loads a single HTML page and dynamically updates content without full page reloads.
Web Font Optimization
Techniques for loading custom fonts efficiently to minimize their impact on page load performance and visual stability.
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.
Web Caching Strategies
Techniques for storing copies of web resources at various levels to reduce server load, bandwidth, and response times.
HATEOAS
Hypermedia As The Engine Of Application State — a REST constraint where API responses include links to related actions and resources.
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