What is 'Parametrization', 'Forward compatibility' and 'Backward compatibility' in Selenium web-driver?

  Parametrization

1. Some-times to execute the test script we have to fetch the Test Data.
2. This test data can be from xls or spread-sheet.
3. So the process of reading the test data from external source like xls files  is called 'Parametrization'.

  Forward compatibility

• Its the ability of selenium 1/RC to execute the scripts created in selenium web-driver.

 Backward compatibility

• Its the ability of selenium web-driver to execute the scripts created in selenium 1/RC.