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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

Content Negotiation
An HTTP mechanism where client and server agree on the best representation of a resource based on format, language, or encoding preferences.
JSON Schema
A vocabulary for validating the structure and content of JSON data, ensuring API requests and responses conform to expected formats.
PHP
A widely-used server-side scripting language designed for web development that powers over 75% of websites including WordPress.
CORS Headers
HTTP headers that control cross-origin resource sharing between different domains, specifying allowed origins, methods, and headers.
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.
SEO (Search Engine Optimization)
The practice of optimizing websites to rank higher in search engine results, increasing organic traffic.
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