If you are interested in browser automation or web application 
testing you may have already heard of Selenium. Since there is a lot of terminology related to this framework, it is easy for you to get lost, especially if you come to Selenium for the first time. In this article I want to save your day by providing a short and clear explanation of what is what in the Selenium project.
What is Selenium?
Selenium is a web application testing framework that allows you to write tests in many programming languages like Java, C#, Groovy, Perl, PHP, Python and Ruby. Selenium deploys on Windows, Linux, and MAC OS.
It is an open-source project, released under the Apache 2.0 license, so you can download and use it without charge.
Selenium