There are so many differences between Selenium RC and Selenium WebDriver. But the major difference between these two is in their architecture.
Below are some other differences between them:-
Now coming to Selenium WebDriver, on the other hand, Selenium WebDriver interacts with the browser natively. It uses the browser's native support for automation to drive them without using the support of the selenium server. WebDrive has a driver for each browser. For example, running a test on Firefox, WebDriver will use Firefox Driver to drive the automation test. Because of this, it provides better interaction with the browser then Selenium RC. The APIs written for WebDriver is completely object-oriented which makes it easier to work with. If you are looking to have a certificate in Selenium then you must take up the following Selenium Training Course.