Webhooks are a common integration mechanism between systems. At my organization we call them Outgoing Webhooks when we are a Webhook Provider and we're sending out our system's data out. And we call Incoming Webhooks when we're the receiver of data from other systems.
The business value is that users can request our system to send one of their other system a piece of data in real time.
It combines a lot of simple and straight-forward tech to give a huge business benefit with easy drag-and-drop system integration.