Selenium Introduction

• It is an open/ free source automated testing suite to test web applications.
• Selenium has four components namely,
  i. Selenium IDE (Integrated Development Environment)
  ii. Selenium RC (Remote Control)
  iii. Selenium WebDriver
  iv. Selenium Grid
• It implements a more modern and stable approach in automating the browser's actions. 
• Selenium is better than QTP in terms of costs and flexibility. It also allows you to run tests in parallel, unlike in QTP where you are only allowed to run tests sequentially.
• At the time of execution selenium has control over browsers
•  It supports different platforms and browsers. 
• Operation System Support  

1. Windows
2. Mac OS
3. Linux
4. Solaris 

• Browser Support 

1. Microsoft Edge version 12.10240 & above 
2. Firefox 3.0 and above 
3. Google Chrome 12.0. and above 
4. Opera 11.5 and above 
5. Android - 2.3 and above for phones and tablets
6. iOS 3+ for phones (devices & emulators) and 3.2+ for tablets (devices & emulators) 
7. HtmlUnit 2.9 and above

• Programing Language Support:- Many languages are supported including C#, Java, Perl, PHP, Python and Ruby.