I thought I had to post this because of the way people tend to confuse with terminologies used in context with Selenium.
Courtesy to this post: “A Digression about Jargon” section @ http://www.aosabook.org/en/selenium.html
Selenium Core is the heart of the original Selenium implementation, and is a set of JavaScript scripts that control the browser. This is sometimes referred to as “Selenium” and sometimes as “Core”.
Selenium RC was the name given to the language bindings for Selenium Core, and is commonly, and confusingly, referred to as just “Selenium” or “RC”. It has now been replaced by Selenium WebDriver, where RC’s API is referred to as the “Selenium 1.x API”.
Selenium WebDriver fits in the same niche as RC did, and has subsumed the original 1.x bindings. It refers to both the language bindings and the implementations of the individual browser controlling code. This is commonly referred to as just “WebDriver” or sometimes as Selenium 2. Doubtless, this will be contracted to “Selenium” over time.
Tech-Niche 