---
title: "WhatsApp concepts overview"
description: "Understand WhatsApp platform concepts including session windows, channel types, and message lifecycles."
---

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

# WhatsApp concepts overview

To build reliable integrations with Wazapin, you must understand WhatsApp's native platform concepts. WhatsApp enforces rules around when you can message users, what types of channels you can use, and how messages are delivered.

> Fetch the complete documentation index at: https://docs.wazapin.id/llms.txt

## Core concepts

Explore the fundamental concepts of the WhatsApp platform:

- [Customer service window](/whatsapp-basics/session-window) — Learn about the 24-hour window and session vs. template messages.
- [Channel types](/whatsapp-basics/channel-types) — Compare official WhatsApp Business API channels with unofficial channels.
- [Message lifecycle](/whatsapp-basics/message-lifecycle) — Track messages from queued status to sent, delivered, and read status.

## When this matters

Understanding these concepts is critical when:
- Designing outbound notification systems (e.g., OTPs, alerts).
- Handling inbound customer support chat flows.
- Troubleshooting message delivery failures or billing changes.

## Related links
- [Connect your number](/getting-started/connect-channel)
- [Quickstart](/getting-started/quickstart)
- [Set up webhooks](/receive-messages/overview)

Source: https://docs.wazapin.id/whatsapp-basics/overview/index.mdx