# Real-Time Voice & Video (/en/introduction/realtime-audio-video)

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

![Video Calling overview](https://assets-docs.agora.io/images/video-calling/video-calling-overview.png)

Real-Time Audio & Video is the capability layer for products where live media is the primary user experience. This category covers two-way voice and video interaction, host-audience live experiences, large-scale broadcast delivery, and device-oriented real-time connectivity.

Agora's product map for this layer includes:

* **Voice Calling**
* **Video Calling**
* **Interactive Live Streaming**
* **Fusion CDN broadcast delivery**
* **IoT / RTSA edge-device connectivity**

## What this category is good for [#what-this-category-is-good-for]

This category is the right entry point when you need:

* one-to-one or group voice and video calling
* meetings, classrooms, and telehealth sessions
* creator-led or host-audience live interaction
* broadcast-style delivery to larger audiences
* smart-device, camera, or edge-terminal media connectivity

The shared requirement is stable, low-latency media transport with clear session behavior across networks, devices, and participant roles.

## Capability map [#capability-map]

<CardGrid>
  <FeatureCard title="Voice Calling">
    Low-latency voice interaction for calling, social audio, customer communication, and lightweight live sessions.
  </FeatureCard>

  <FeatureCard title="Video Calling">
    Real-time face-to-face interaction for meetings, classrooms, telehealth, and collaboration products.
  </FeatureCard>

  <FeatureCard title="Live Streaming">
    Host-audience interaction for creator events, live communities, and interactive broadcast-style products.
  </FeatureCard>

  <FeatureCard title="Broadcast">
    Fusion CDN-based distribution for larger viewer populations and playback-oriented live delivery.
  </FeatureCard>

  <FeatureCard title="Edge Devices">
    RTSA-based device connectivity for smart cameras, displays, embedded endpoints, and IoT-oriented real-time media.
  </FeatureCard>
</CardGrid>

## Start here [#start-here]

<OverviewSpotlightGrid>
  <OverviewSpotlightCard href="/en/realtime-media/rtc" title="RTC" variant="platform" />

  <OverviewSpotlightCard href="/en/realtime-media/fusion-cdn" title="Fusion CDN" variant="platform" />

  <OverviewSpotlightCard href="/en/realtime-media/rtsa" title="RTSA" variant="platform" />
</OverviewSpotlightGrid>

## Key characteristics [#key-characteristics]

<CardGrid>
  <FeatureCard title="Shared media foundation">
    Use the same real-time transport model across calling, live interaction, broadcast expansion, and device connectivity.
  </FeatureCard>

  <FeatureCard title="Flexible interaction patterns">
    Support peer-to-peer, group, host-audience, and device-oriented topologies without switching to a different conceptual model.
  </FeatureCard>

  <FeatureCard title="Scale from interaction to distribution">
    Start from interactive sessions, then extend into larger audience delivery or downstream cloud media services.
  </FeatureCard>

  <FeatureCard title="Cross-device coverage">
    Reach web, mobile, desktop, and edge-device products with consistent session and media semantics.
  </FeatureCard>

  <FeatureCard title="Works with adjacent layers">
    Combine media transport with messaging, AI, transcription, recording, and analytics as product requirements grow.
  </FeatureCard>

  <FeatureCard title="Network resilience">
    Keep the live experience usable under real-world packet loss, geography, and device constraints.
  </FeatureCard>
</CardGrid>

## What to read next [#what-to-read-next]

* [RTC](/en/realtime-media/rtc)
* [Fusion CDN](/en/realtime-media/fusion-cdn)
* [RTSA](/en/realtime-media/rtsa)