Webhook is a lightweight, open-source tool designed to facilitate the execution of shell commands in response to HTTP requests. It acts as a simple web server that listens for incoming webhooks, commonly used in continuous integration and deployment workflows to automate tasks such as code deployment, testing, or notifications. Users can configure multiple hooks with specific triggers, payload validation, and command execution rules, enabling seamless integration with services like GitHub, GitLab, and other platforms that support webhooks. Webhook is highly customizable, easy to set up, and written in Go, making it efficient and portable for various environments.