APIs enable two-way communication between software applications. Requests, also called polling, drive communication between the two applications. On the other hand, webhook subscriptions allow for one-way data sharing triggered by events rather than requests.In the following two images, you can see how webhooks work and how they can provide more efficient, cost-effective, and timely data access than API polling.
Polling with APIs
Webhooks
For the most part, webhooks can be seen as a subset of the POST method, as illustrated in the image below. This is because webhooks perform a POST call to an API endpoint you set up in your environment. When setting up your webhook subscription, designate the endpoint you created as the place the data will be POSTed when sent.
