Caching stores copies of data in temporary storage locations for faster retrieval than accessing the original source. Web caching operates at multiple levels: browsers cache files locally, CDNs cache content at edge servers worldwide, and application caches store processed data to avoid repeated computation.
Browser Caching
Browsers store downloaded files locally so returning visitors do not need to re-download images, , and scripts. Cache-Control headers tell browsers how long to keep files before checking for updates. Proper browser caching dramatically reduces load times for repeat visitors.
However, browser caches are private to each user. First-time visitors receive no benefit until their browser builds its local cache.
CDN Caching
Content Delivery Networks cache files on servers distributed globally. When users request content, the nearest edge server responds rather than the origin server. This reduces latency and decreases load on your primary infrastructure.
CDN caching benefits both new and returning visitors because cached content serves from shared edge locations. When traffic surges, CDN caches absorb most requests, allowing origin servers to handle only the remainder.
Ecommerce Caching Strategies
Product images, stylesheets, and static assets cache easily with long expiration times. Product listings and search results can cache with shorter durations. Shopping cart contents use session-level caching to persist selections without repeated database queries.
Dynamic personalization complicates caching. cannot serve from shared caches without showing incorrect data to users. Most implementations cache static elements while fetching personalized components separately.
