difference between thoughtworks and openqa selenium

Question

What is the difference between openqa.selenium and thoughtworks.selenium? How are they compatible with each other?

There is no class Selenium in package openqa.selenium, but there is class WebDriver. I want to use webElement in my test, which imports thoughtworks.selenium.Selenium.

Some tutorials use openqa.selenium, other thoughtworks.selenium, and I am completely confused.

Answer 1

• thoughtworks.selenium is the original Selenium (aka Selenium 1, or Selenium-RC).
• openqa.selenium is Selenium 2 aka Selenium WebDriver.