In more detail
Serving images, scripts and styles from nearby cuts Latency, takes load off the origin server and helps absorb traffic spikes and some attacks. A CDN works by caching, so Cache-Control headers decide how long copies stay fresh.
Glossary
Web & HTTP
CDN
A CDN (content delivery network) is a network of servers around the world that stores copies of a site's files and serves them from the location nearest each visitor.
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See also
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Glossary
Latency
Latency is the delay between sending a request and starting to receive the response, usually measured in milliseconds.
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Glossary
Load balancer
A load balancer is a system that spreads incoming requests across several servers so no single one is overwhelmed.
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Glossary
Proxy
A proxy is an intermediary server that passes requests and responses between a client and the destination.
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Cheat sheet
HTTP Headers Cheat Sheet
Request and response headers, Cache-Control directives, security headers, cookie attributes and CORS headers.