# Track User Events

Start sending your users' **events** on your app to **Referd**, along with any **metadata** that describes the event. Depending on your **Referd** programs configuration, the player can be rewarded based on the sent events.

Tracked **events** can be app events or server side events depending on how you would like to design your programs. App **events** can be sent via the avialable SDK interface and server-sdie **events** can be sent to **Referd** via the [Track Events API](/api-reference/api-reference/event.md).

Every `Track Event` call records a single user action. We call these “**events**”. We recommend that you make your event names human-readable, so that everyone can know what they mean instantly.

**Event metadata** are extra pieces of information you can tie to events you track. They can be anything that will be useful while designing your program.


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