Hi Knaik99 -
Webhooks are used by an external system in order to notify the local system about a certain event or update.
They are like API calls in the opposite direction. HTTP POST can be sent from vManage to any service who is listening for this.
For example, when you set up a webhook in vManage that hits a "serverless" piece of code in AWS, it fires off an event to page a bunch of people in the organization.
There are several online services that you can connect to do these things. Refer to
https://testwebhooks.com/.<>
Another example is to create something in Slack in order to receive vManage webhooks.
Refer to
https://api.slack.com/incoming-webhooksHTH.