Hi srinithya,
Using selenium we can not access windows application. So, we can not directly click on the back button. But, we can do one thing that will serve our purpose :-
WebDriver driver = new FirefoxDriver();
driver.navigate("
http://www.flipkart.com/");
driver.findElement(By.xpath("//*[@id='fk-pp-carousel-']/li[1]/a/div")).click();
Thread.sleep(10000L);
driver.navigate.back();
The driver.navigate.back() will serve your purpose.
Thanks and regards
Sitam