> ## Documentation Index
> Fetch the complete documentation index at: https://docs.interhuman.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

> Detect and interpret engagement, signals, and quality.

# Detect and interpret conversational behavior.

Interhuman is the social intelligence API for developers to detect and interpret engagement state, social signals, and conversation quality in real-time or post-processing.

## How to integrate

<CardGroup cols={2}>
  <Card title="Analyze uploaded video" icon="file-video" href="/api-reference/upload-analyze">
    Upload video files for comprehensive behavioral analysis.
  </Card>

  <Card title="Stream Analysis" icon="tower-broadcast" href="/api-reference/stream-analyze">
    Stream raw video data for real-time interpretation.
  </Card>
</CardGroup>

## Capabilities

The API provides access to multimodal models that produce:

* **Engagement State**: Time-bounded states such as engaged, disengaged, and neutral states.
* **Social Signals**: [Agreement, confusion, engagement, and more](/explanations/social-signals) with timing, probability, and rationale.
* **Conversation Quality**: Aggregate and timeline scores for energy, rapport, authority, learning, and clarity.

## Authentication

Use your API key directly when calling endpoints by sending `Authorization: Bearer <api_key>`. See [Authentication](/api-reference/authentication) and [Get an API key](/how-to/get-api-key).