# Tracking events

The two main events collected by the platform are impression events and click events. These events are useful for measuring the performance indicators of sponsored product campaigns.

{% hint style="info" %}
If you are using the client-side integration mode, triggering the impression event is not necessary. It is automatically handled by the JavaScript library after the sponsored ads are loaded. In the case of a server-side integration, please follow the instructions below.
{% endhint %}

## Use of datas- \* attributes

To trigger the impression and click events, simply add the `data-vzbl-id` attribute to the HTML tag surrounding the sponsored ad blocks, with the value being the **tracking ID** of the ad returned by the API.

```javascript
<div data-vzbl-id="fa32460f-3593-430b-87b0-1a1c6098efb2">
```

HTML5 allows you to associate data directly with an HTML element using `data-*` attributes. This approach makes it easier to store data within the document, directly within the HTML elements.

The JavaScript library will automatically send the events to the **Veasybl** server.


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