# Custom Event

Track unique user interactions and send data that isn't covered by standard events by using custom events in the Data 360 Module for the Engagement Mobile SDK. Include a flexible payload of user-defined attributes to capture specific interaction details, then map them to a Custom Event Schema in Data 360.

The Engagement Mobile SDK currently supports two major versions: [Version 3.x](/docs/data/data-cloud-engagement-mobile-sdk/guide/c360a-api-engagement-mobile-sdk-custom-event-v3.md) and [Version 2.x](/docs/data/data-cloud-engagement-mobile-sdk/guide/c360a-api-engagement-mobile-sdk-custom-event-v2.md). To take advantage of the latest features and improvements, upgrade to Version 3.x.