A webhook is a mechanism that allows an application to transmit data from one system to another whenever an event is defined.
It is a form of implementation of the “callback API” that allows applications to receive real-time notifications about events that occur in other applications.

Webhooks are commonly used to facilitate integration between applications, allowing applications to communicate and coordinate with each other to accomplish certain tasks.
For example, when there is a new update on a website, a webhook can trigger a task in another application to process or store the data.

Difference between Webhook and API

APIs (Application Programming Interface) and webhooks are two ways to facilitate communication between applications.
However, they have some important differences:

1. Functionality: An API is a protocol defined to access features and data in an application, while a webhook is a mechanism to send real-time notifications to other applications whenever there is a defined event.
2. Direction of communication: APIs allow applications to request and receive data from other applications, while webhooks allow applications to receive notifications from other applications without explicitly requesting them.
3. Security: APIs often require authentication and authorization to access features and data, while webhooks usually do not require the same authorization.
4. Scalability: APIs allow applications to request large amounts of data in a single request, while webhooks are more suitable for receiving small amounts of real-time notifications.

In general, APIs and webhooks each have their advantages and disadvantages, and the best choice between the two will depend on the specific integration needs between applications.