Webhooks are lightweight, event-driven HTTP callbacks that let one system notify another the moment something happens, instead of the second system repeatedly polling for updates. When an event occurs, such as a payment completing, a form submission, or a code push, the source application sends an HTTP POST request with a JSON payload to a pre-registered endpoint URL. The receiving service verifies the request (typically with a signature or secret token), processes the data, and returns a quick 2xx response. Webhooks reduce latency and API overhead, and they make it easy to integrate third-party services like Stripe, GitHub, or Slack. In production they are usually paired with retry handling, idempotency checks, and queue-based processing to stay reliable.

If you tell me where this will go (resume, portfolio, project README, or a tech stack slide), I can adjust the tone and length, or tie it to the specific tools you used with webhooks.