A webhook is sometimes called a web callback or push API. It's a way for one system to send real-time information to another system - data is exchanged immediately an event happens.
In a typical standard API, one system will keep asking another for new data - so when processing real-time data, you have to keep asking (or polling) for new data continuously. Webhooks are therefore much more efficient for both systems.
Setting up a webhook connection between two systems is straightforward and quick when following the methodical steps required.
And to keep the data secure, we use https secure connections and authentication tokens.