Selenium is a popular framework for testing the user interface (UI) of a web application. It is an extremely powerful tool for running end-to-end functional tests. You can write tests in several programming languages and Selenium executes them into one or multiple browsers.
Selenium 1 and WebDriver merged to produce a better product—Selenium 2, or Selenium WebDriver, which was released in 2011. Selenium 2 has the clean and object-oriented APIs from WebDriver and interacts with browsers in the best way possible for that browser. Selenium 2 does not use a JavaScript sandbox, and it supports a wide range of browsers and multiple language bindings.
This article explains how to make the transition from Selenium 1 to Selenium 2. Examples show how to use Selenium 2, how to test remotely, and how to migrate your written tests from Selenium 1 to Selenium 2.