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👋 Hi! I'm Dastan, author of Hack Frontend. Always open to professional networking => connect with me on LinkedIn.
CDN (Content Delivery Network) is distributed server network used for fast delivery of static content (images, styles, scripts, videos, etc.) to users worldwide.
Essence: site content is cached and duplicated on many servers located in different points of planet (so-called edge servers). User loads resources from server closest to them, not from main hosting.
Content loads from closest server → faster render and page responsiveness.
CDN serves all heavy files (CSS, JS, fonts, images), freeing backend.
If one of CDN servers is unavailable — user will get resource from nearest available.
CDN can include DDoS attack protection, traffic filtering and SSL encryption.
.css, .js, .html.woff, .ttf).jpg, .png, .svg, .webp)Popular CDN Examples
<link
rel="stylesheet"
href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css"
/>
Fact:
CDN is used by almost all major sites — from YouTube to GitHub, to ensure fast and stable data delivery to any point in world.