Selenium v1.0 :
* Version 1.0 was the initial release of Selenium.
* It included three tools: Selenium IDE, Selenium RC, and Selenium Grid.
Selenium v2.0:
* Selenium WebDriver was introduced replacing Selenium RC in version "2.0".
* With the onset of WebDriver, RC got deprecated and moved to the legacy package.
Selenium v3 :
* The latest release Selenium 3 has new added features and functionalities.
* It includes Selenium IDE, Selenium WebDriver, and Selenium Grid.
