Glossary16 terms
Glossary.
Plain-language definitions of the terms you'll meet around web servers, caching and protocols.
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Terms
| Term | Definition |
|---|---|
| ADC | Application Delivery Controller — a device or software that load-balances, caches and secures traffic in front of servers. |
| Brotli | A compression algorithm that typically produces smaller files than GZIP. |
| CDN | Content Delivery Network — servers around the world that cache and deliver content close to users. |
| Core Web Vitals | Google's user-experience metrics: LCP, INP and CLS. |
| ESI | Edge Side Includes — markup that lets cached pages include separately cached or dynamic fragments. |
| Event-driven | A server design where few processes handle many connections using non-blocking I/O. |
| HTTP/2 | A binary, multiplexed version of HTTP that sends many requests over one connection. |
| HTTP/3 | The newest HTTP version, running over QUIC instead of TCP. |
| LSAPI | LiteSpeed Server API — a fast protocol between LiteSpeed and application runtimes. |
| LSCache | LiteSpeed's built-in, server-level full-page cache. |
| OCSP stapling | Delivering certificate revocation status with the TLS handshake. |
| QUIC | A UDP-based, encrypted transport protocol that underpins HTTP/3. |
| reCAPTCHA | A challenge that distinguishes humans from bots. |
| suEXEC | Running scripts as the owning user for security isolation. |
| TTFB | Time To First Byte — how long before the first byte of a response arrives. |
| WAF | Web Application Firewall — filters malicious HTTP requests. |
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