How Python Selenium's Client-Server Architecture Automates Real Browsers

Python Selenium uses a client-server architecture in which user-written Python code sends HTTP requests that a browser-specific driver translates into real browser actions. The four core components are the user's code, Python bindings (the pip library), the browser driver, and the web browser itself. Python bindings convert functions like click() into JSON-encoded WebDriver REST API requests, which the driver processes and forwards to the browser. Since Selenium 4, the Selenium Manager automatically detects and installs the required drivers, removing the need for manual configuration. Selenium 4 also replaced the older JSON Wire Protocol with the modern W3C WebDriver standard, enabling more direct communication between the driver and the browser.