CDNContent Delivery Network

A Content Delivery Network (CDN) is a fleet of servers spread across the globe that caches and serves your content from the location nearest to each user. Static files, images, video, HTML and increasingly compute all live at the edge, so the round-trip to your origin in one data centre happens rarely or never.

The immediate benefit is speed. A user in Sydney loading a site whose origin is in London might cut hundreds of milliseconds off every request. The secondary benefits are resilience — the CDN absorbs traffic spikes and DDoS — and cost: serving from cache is far cheaper than serving from origin.

Modern CDNs (Cloudflare, Fastly, Vercel Edge Network, AWS CloudFront, Akamai) are not just file caches. They run compute at the edge, terminate TLS, rewrite headers, A/B test, do image transformation and bot mitigation. The boundary between CDN and application platform is blurring fast.

Devinsta treats CDN configuration as a first-class part of the build, not an afterthought. Cache headers, surrogate keys, image policies and edge logic get the same review as application code, because most performance regressions in production trace back to cache behaviour rather than code.