files/en-us/web/webdriver/reference/bidi/index.md
WebDriver BiDi is a bidirectional protocol for browser automation that provides event-driven communication between the local end (the automation client) and the remote end (the browser). This reference documents the modules, commands, and events available in WebDriver BiDi.
Unlike the HTTP request-response model of WebDriver classic, BiDi enables real-time events and supports advanced automation scenarios through WebSocket-based communication.