Silk Test Tool Selenium Test Tool
Borland Silk test is not a free testing tool
Selenium is completely free test automation tool
Silk test supports only Internet Explorer and Firefox
Selenium supports many browsers like Internet Explorer, Firefox, Safari, Opera and so on
Silk test uses test scripting language
Selenium suite has the flexibility to use many languages like Java, Ruby,Perl and so on
Silk test can be used for client server applications
Selenium can be used for only web application
