AsyncAPI is an Open Source initiative that exists to improve Event-Driven Architectures.

Learn AsyncAPI

At the end of this guide, you will know the following:

-   What is Event-Driven Architecture?
-   What is AsyncAPI?
-   What are the different parts of AsyncAPI?

AsyncAPI is an Open Source initiative that exists to improve Event-Driven Architecture. In this guide, you will learn about AsyncAPI and how you can use AsyncAPI in your application.

## What is Event-Driven Architecture?

In an Event-Driven Architecture, a system reacts to an event and sends an acknowledgment. In this type of architecture, a system generally sends a response when an event occurs.

An Event-Driven Architecture contains the following parts:

| Name           | Description                                                                                                               |
| -------------- | ------------------------------------------------------------------------------------------------------------------------- |
| Publisher      | The application that sends the message                                                                                    |
| Message broker | An intermediate infrastructure responsible for facilitating the sending of a message from the Publisher to the Subscriber |
| Subscriber     | The application that receives the message sent by the Publisher                                                           |
| Message        | A piece of information that is sent to all the interested Subscribers from a Publisher via the Message broker             |
| Channels       | The Message broker sends the message to the Subscribers via multiple channels                                             |

In an Event-Driven Architecture, a system reacts to an event and sends an acknowledgment. In this type of architecture, a system generally sends a response when an event occurs.

What is Event-Driven Architecture?

## What is AsyncAPI?

AsyncAPIs work on the principle of Event-Driven Architecture (EDA). In AsyncAPIs, multiple Subscribers can subscribe to a Publisher. When an event occurs, the Publisher can notify all the Subscribers via the Message broker.

<AnatomyOfAsyncAPIRequest />

## Example of an AsyncAPI

The following component shows an example of how an AsyncAPI works.

<AnatomyOfAsyncAPI />

AsyncAPIs work on the principle of Event-Driven Architecture (EDA). In AsyncAPIs, multiple Subscribers can subscribe to a Publisher. When an event occurs, the Publisher can notify all the Subscribers via the Message broker.