Selenium

Introduction: 

Selenium is a suite of tools for browser automation. It is composed of 
"IDE", a recording and playback mechanism, "WebDriver" and Remote 
Control "RC" which provide APIs for browser automation in a wide variety
 of languages, and "Grid", which allows many tests using the APIs to be 
run in parallel. QA Tester should not forget to mention during interview
 that with the release of Selenium 2, Selenium RC has been officially 
deprecated in favor of Selenium WebDriver. It works with most browsers, 
including Firefox from 3.0 up to 8, Internet Explorer 8, Google Chrome, 
Safari and Opera 11.5.

 Selenium could be used for the functional, regression, load testing of 
the web based applications. 

 Advantages & Features of Selenium 

1.Intelligent field selection will use IDs, names, or XPath as needed 
2. It is a record & playback tool and the script format can be written in
various languages including : C#, Java, PERL, Python, PHP, HTML 
3. Auto complete for all common Selenium commands 
4. Debug and set breakpoints 
5. Option to automatically assert the title of every page 
6. Support for Selenium user-extensions.js file

Selenium Limitations 

 Selenium IDE has many great features and is a fruitful and 
well-organized test automation tool for developing test cases, in the 
same time Selenium IDE is missing certain vital features of a testing 
tool: conditional statements, loops, logging functionality, exception 
handling, reporting functionality, database testing, re-execution of 
failed tests and screenshots taking capability. Selenium IDE doesn't for
 IE, Safari and Opera browsers.