# CDN

> Content delivery network — copies of your assets on servers near your visitors, so 'far away' stops meaning 'slow'.

A request from Budapest to a server in Virginia carries its distance in milliseconds, both ways, for every file. A CDN puts cached copies on edge servers worldwide, so the same file travels fifty kilometers instead of an ocean — and absorbs traffic spikes and much of the attack surface while it is at it.

For static assets and pre-rendered pages a CDN makes 'hosting' largely a non-question: the origin serves deploys, the edge serves visitors. The discipline is in cache behavior — long cache lifetimes on fingerprinted files, careful invalidation on HTML, and knowing what must never be cached.

## Related terms

- https://dfieldsolutions.com/en/glossary/edge-computing.md
- https://dfieldsolutions.com/en/glossary/http-caching.md
- https://dfieldsolutions.com/en/glossary/static-generation.md

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Source: https://dfieldsolutions.com/en/glossary/cdn
DField Solutions — Dunakeszi, Hungary — dezso@dfieldsolutions.com
Booking: see https://dfieldsolutions.com/en/contact