# Overview

Webhook events are one-way events sent to your app over HTTP to notify you when an event occured. Unlike events that are sent over Gateway connections, events sent over webhooks are not realtime or guaranteed to be in order.

While incoming webhooks are triggered by an external service, webhook events (i.e. outgoing webhooks) are triggered by events happening in Gearment. This means your app will need to set up a public URL where you can receive HTTP events, which is detailed in the preparing for events section.

> You can configure only one webhook URL per webhook event and version.