How does Selenium WebDriver Work?

Working for the Selenium is explained below:

1. User code: The user creates automation scripts. These scripts contain instructions and commands for interacting with web elements and web pages.
2. Selenium Client Library: This library acts as a bridge between user code and WebDriver. It provides several APIs that allow user code to control web browsers and facilitate web interaction commands.
3. WebDriver API: The WebDriver API defines custom instructions for internet interfaces. Various browser providers have applied their own WebDriver implementations which can be well matched with this API. It establishes a common language for browser automation.
4. Browser-precise driving force: Each browser (e.g., Chrome, Firefox) has its personal WebDriver implementation (e.g., ChromeDriver, GeckoDriver). These drivers are liable for starting a specific browser and setting up a conversation channel with the WebDriver.
5. Browser: The Webdriver sends commands to the browser to execute specific actions, like clicking elements or inputting text, which the browser then carries out accordingly.

Selenium is a widely used tool for testing web-based applications that checks if they are doing as expected. It is a prominent preference amongst testers for cross-browser testing and is viewed as one of the most reliable systems for web application automation evaluation. Selenium is also platform-independent, so it can provide distributed testing using the Selenium Network.

Its features, reach, and strong community assistance make it a powerful device for effective web application testing.