Answer 1: Selenium is a browser automation tool which lets you automated operations like – type, click, and selection from a drop down of a web page.

Answer 2: Selenium is a library which is available in a gamut of languages i.e. java, C#, python, ruby, php etc. while most commercial tools are limited in their capabilities of being able to use just one language. More over many of those tools have their own proprietary language which is of little use outside the domain of those tools. Most commercial tools focus on record and replay while Selenium emphasis on using Selenium IDE (Selenium record and replay) tool only to get acquainted with Selenium working and then move on to more mature Selenium libraries like Remote control (Selenium 1.0) and Web Driver (Selenium 2.0).

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