# Server-side and extensions (/en/realtime-media/server-and-extensions)

> For AI agents: see the complete documentation index at [llms.txt](/llms.txt).

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## RTC Server SDK [#rtc-server-sdk]

Lets the backend participate directly in RTC media send, receive, and control flows.

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## SDK extension plugins [#sdk-extension-plugins]

Support capability enhancement and customized audio-video effects on top of the existing SDK stack.

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## Marketplace [#marketplace]

Provides a faster path to selecting, purchasing, and connecting external real-time modules into your product.