Selenium | Server

Selenium Server (often referred to as the Selenium Grid’s hub or the legacy Selenium RC server) is a critical component of the Selenium ecosystem. It acts as a middleman between test scripts and web browsers, enabling remote execution, parallel testing across multiple machines and browsers, and support for legacy protocols. While the introduction of Selenium WebDriver reduced reliance on the server for local execution, Selenium Server remains indispensable for and cross-browser grid infrastructure .

In recent versions (Selenium 4), the server can run in "Standalone" mode. selenium server