Selenium is a Functional Testing Tool. It's support Java, C#, PHP, Python, Ruby, Perl & more languages. But Java is widely used.
I will try to cover Selenium with Java.
01) Selenium IDE
02) Selenium RC
03) Selenium WebDriver
Selenium IDE is a Firefox Addin. It's support record & Play back.
Selenium RC is known as Selenium 1.
Selenium WebDriver knows as Selenium 2.
Selenium IDE is a Firefox Addin. It's support record & Play back.
Selenium RC is known as Selenium 1.
Selenium WebDriver knows as Selenium 2.