What are the key differences between Selenium WebDriver and Selenium RC (Remote Control)?

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Selenium WebDriver and Selenium Remote Control (RC) are both tools from the Selenium suite, but they differ significantly in architecture, functionality, and usage.

1. Architecture:
Selenium RC uses a server (RC Server) to inject JavaScript into browsers, acting as a proxy between the test script and the browser. In contrast, Selenium WebDriver communicates directly with the browser using each browser’s native automation support, eliminating the need for a middle server.

2. Speed and Performance:
WebDriver is faster and more efficient because it communicates directly with the browser. RC is slower due to its reliance on JavaScript injection and server interaction.

3. Browser Compatibility:
WebDriver provides better support for modern browsers and handles dynamic web elements more effectively. RC, being older, has limited compatibility with newer browser versions and standards.

4. API Simplicity:
WebDriver offers a more concise and object-oriented API, making test development and maintenance easier. RC’s API is more complex and less intuitive.

5. Support and Updates:
Selenium RC is now deprecated, and the Selenium project recommends using WebDriver, which continues to receive updates and community support.

In summary, Selenium WebDriver is a more robust, faster, and modern solution compared to the now-outdated Selenium RC, which has been phased out in favor of WebDriver's improved architecture and ease of use.

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