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## Resource: Events



## Article: Introduction

## Article Link: https://dev.wix.com/docs/velo/events-service-plugins/email-marketing/events/introduction.md

## Article Content:

---
title: Introduction
---

# Introduction

Wix Email Marketing events are triggered when certain events occur with email marketing in your site's backend. You can write event handlers that react to these events. Event handler functions receive data that corresponds to the backend event that has occurred. Use event handlers to create custom responses to email marketing events.

>**Note:** Backend events aren't triggered when previewing your site. 

## Working with Email Marketing Event Handlers

To add an email marketing event handler, add an **events.js** file to the **Backend** section of your site if one does not already exist. All event handler functions for your site are defined in this file.

Event handler functions are defined using the following pattern:

```js
export function <wixAppName>_<eventName>(event) { }
```

For example, an event handler that handles the activity update of an email campaign looks like this:

```js
export function wixEmailMarketing_onCampaignEmailActivityUpdated(event) { }
```