A webhook is a URL that allows third-party applications to trigger a specific action in Blink without the need for that application to to have a Blink account. The action is unauthenticated. Anyone with the URL may trigger this action anonymously at any time.
The most common use is for a third-party app to send a message into a Blink Private Chat or Channel.
If a human being were to type a webhook URL directly into their browser nothing obvious to them would happen, since webhooks are not designed for humans to interact with directly.
Some of the Blink Bots will offer to generate a webhook for you in order to connect with a third-party service. It's important to keep the URL secret and only disclose it to the third party developers and applications that you trust, since once someone has that URL they may use it to send messages into the chat it was generated from.
Each webhook is unique and is linked to a specific chat or channel.
One example of using a webhook at Blink: generating a URL to supply to Pagerduty in order to receive Service Incidents directly into a Blink team chat.