A webhook is a way for one app to notify another the instant something happens, by sending an automatic message to a set web address. It lets apps react to events in real time instead of repeatedly asking "has anything changed yet?"
Webhook
How a webhook works
An app that supports webhooks lets you register a web address to notify when a chosen event occurs, like a payment succeeding or a form being submitted. When that event happens, the app sends a message to your address with the details, and your app runs whatever you set up in response. The difference from ordinary requests is direction: instead of your app asking for updates on a schedule, the other service pushes the update to you the moment it happens.
Examples
You build an online store connected to a payment service, and set up a webhook so that when a payment goes through, your app is notified right away and marks the order as paid. In another app, a webhook posts a Slack message the moment someone signs up, so your team sees it instantly without anyone refreshing a dashboard.
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