A webhook is a mechanism for sending real-time data from one web application to another. When an event occurs in the source application, such as a new order being placed or a user signing up, a webhook sends a notification to the destination application in the form of an HTTP POST request. The destination application can then process the data and use it to trigger a specific action or workflow.

Webhooks are commonly used in web development and software integration to automate and streamline data exchange between different applications. They are a popular alternative to traditional polling methods, which require the destination application to continuously check the source application for updates.

Webhooks can be configured to send data in a variety of formats, including JSON, XML, or plain text. They can also be customized to include specific data fields or parameters that are relevant to the destination application.

Some common use cases for webhooks include triggering automated workflows in response to specific events, such as sending a notification when a new order is placed, or syncing data between different applications in real-time. Webhooks can also be used to integrate third-party services into a web application, such as payment gateways or messaging platforms.