Event streams sources collect data from your website or app to monitor user actions. These sources include[website libraries](#website-libraries),[mobile](#mobile), and[server sources](#server).

When viewing an the Source Overview page for an event stream source, you can view a line chart and breakdown table that reflects the volume and details of the events that Segment ingested from your source.

You can use the time picker located on the Source Overview page to specify a time period (last 10 minutes, 1 hour, 24 hours, or 7 days) for which you’d like to see data.

The breakdown table displays the following details:

***Event type**: The Segment Spec event type (Track call vs. Identify call, for example)

***Event name**: The event name, provided by you or the source

***Event count**: How many of each event was successfully received by your source

***% Change**: Insight into how the event counts differ from the last comparable time range as a percentage

[Analytics.js](/docs/connections/sources/catalog/libraries/website/javascript/), the JavaScript library, is the most powerful way to track customer data from your website. If you're just starting out, Segment recommends it over server-side libraries as the simplest installation for any website.