Webhook
An automatic notification sent when something happens.
Definition
A webhook is a URL that receives an HTTP POST request when an event occurs in another system. Instead of repeatedly asking "did anything change?" (polling), the other system pushes a notification to your webhook URL the moment something happens. It is event-driven communication between services.
Example
When someone pushes code to GitHub, GitHub sends a POST request to your deployment webhook URL, which triggers an automatic deploy of your site.
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