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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

API (Application Programming Interface)
A set of rules and protocols that allows different software applications to communicate and exchange data.
HTTP/3
The latest HTTP version that uses QUIC instead of TCP, providing faster connections and better performance on unreliable networks.
Responsive Design
A web design approach that makes web pages render well on all screen sizes using flexible layouts and media queries.
HATEOAS
Hypermedia As The Engine Of Application State — a REST constraint where API responses include links to related actions and resources.
Web Caching Strategies
Techniques for storing copies of web resources at various levels to reduce server load, bandwidth, and response times.
HTTP/2
The second major version of HTTP that improves performance through multiplexing, header compression, and server push.
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