# Foundational real-time capabilities (/en/realtime-media/foundation-realtime)

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

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## RTC [#rtc]

Owns audio, video, and channel sessions as the real-time base for calling, live streaming, meetings, and classrooms.

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## RTM [#rtm]

Provides low-latency, reliable messaging plus state synchronization for channel messages, presence, and workflow coordination.

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## Instant Messaging IM [#instant-messaging-im]

Fits broader cloud-chat workloads where a full messaging service is needed beyond lightweight real-time coordination.

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## Real-time Transcription & Translation [#real-time-transcription--translation]

Provides ultra-low-latency, high-accuracy speech transcription and translation for captions, multilingual communication, and content understanding.

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## RTSA [#rtsa]

Provides real-time media-stream and signaling transport for device-oriented and terminal-style workloads.