> ## Documentation Index
> Fetch the complete documentation index at: https://developer.z-api.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

> Understand how groups work in Z-API and the available methods

## Overview

In this topic you will learn about all available methods for group management.

As previously mentioned, for WhatsApp everything is a chat. Knowing this, a group is nothing more than a chat and basically everything you send/receive in a chat you can send/receive with groups.

A group has an ID/Phone which is simply the phone number of who created it concatenated with a timestamp, something like "5511999999999-162327528", and this is the ID/Phone you will use as the phone to send messages to your groups.

To get this ID/Phone, use the get/chats method.

In this topic you will also find methods for creating and managing groups.

***

## Group ID/Phone

To better emphasize, think of the group id/phone as the number of who created it concatenated with a timestamp, something like:

```
5511999999999-1623275280
```

<Warning>
  **Attention**

  On November 4, 2021, WhatsApp changed the format for creating new groups.

  **Before:** `"phone": "5511999999999-1623281429"`

  **Now:** `"phone": "120363019502650977-group"`
</Warning>