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

# Key concepts

> The vocabulary you'll see throughout the docs.

A small glossary of the nouns Anyreach uses, and how they relate.

## Agent

A configured AI participant that joins a phone call. An agent has a **voice**, an **LLM**, a **system prompt** (purpose, personality, instructions, guardrails), zero or more **knowledge bases** attached for retrieval, and zero or more **tools** it can invoke during the call.

Agents are versioned. You edit a draft, then **publish** to make it live on the assigned phone numbers.

## Conversation

A single interaction between an agent and one or more participants — a phone call, a web chat or voice session, or an email thread. Each conversation produces a transcript and metadata (duration, outcome, caller ID), plus an audio recording for voice. See [Conversations](/conversations/inbox-overview).

## Channel

The medium a conversation happens over. Anyreach supports four: `telephone` (phone calls), `webrtc` (web voice and chat), `email`, and `text`. One agent can serve several channels, with per-channel overrides. See [Channels](/getting-started/channels).

## Knowledge base

A collection of **sources** (uploaded files or crawled URLs) that have been chunked and embedded into a vector index. Agents query KBs via retrieval — given a user question, the top matching chunks are pulled into the LLM context for that turn.

A KB is identified by a `dataset_id`. Internally KBs are sometimes called *datasets*; in the UI you'll always see "Knowledge Base."

## Workflow

A directed graph of steps that processes input and produces output. Workflows are general-purpose automation: they can be invoked by an agent as a tool, by a webhook, by a schedule, or directly via API.

Workflows are versioned. Only **published** versions can be referenced from agents or external triggers.

## Step

A single node in a workflow. Anyreach ships eight step types — `input`, `code`, `condition`, `http`, `app`, `output`, `wait`, `note` — each with its own configuration and behavior. See the [step reference](/workflows/steps/input).

## Trigger

The event that starts a workflow execution. Triggers come in four flavors: **manual** (run from the UI or API), **scheduled** (cron), **webhook** (external service via Pipedream), and **agent-embedded** (an agent calls the workflow as a tool, or fires it pre/post-call).

## Expression

Inline templating used inside step configuration. Two flavors:

* `{{...}}` — JSONata, for deterministic data transformations
* `${...}` — AI expression, where the contents are sent to an LLM and replaced with the result

See [Expressions overview](/workflows/expressions/overview).

## Phone number

A number you buy or import. Each number has an independent inbound and outbound agent slot. See [Telephony](/telephony/overview).

## Web widget

An embeddable chat-and-voice bubble that puts an agent on your own website. See [Web widgets](/web-widgets/overview).

## Campaign

An outbound dialing job that calls a list of contacts with a voice agent, on a schedule. See [Campaigns](/campaigns/overview).

## How they relate

```
                    ┌──────────────────┐
                    │  Phone Number    │
                    └────────┬─────────┘
                             │ inbound / outbound
                    ┌────────▼─────────┐
                    │      Agent       │  ◄──── system prompt
                    └────────┬─────────┘
                             │
              ┌──────────────┼──────────────┐
              │              │              │
       ┌──────▼──────┐ ┌─────▼─────┐ ┌──────▼──────┐
       │ Knowledge   │ │  Tools    │ │ Conversation│
       │   Base      │ │ (Workflow │ │ (transcript)│
       │ (retrieval) │ │  refs)    │ │             │
       └─────────────┘ └─────┬─────┘ └─────────────┘
                             │ invokes
                       ┌─────▼─────┐
                       │ Workflow  │ ◄── also: webhooks, schedules, API
                       └───────────┘
```