How to switch between multiple windows in Selenium?
Ans. Selenium has driver.getWindowHandles() and driver.switchTo().window(“{windowHandleName}”) commands to work with multiple windows.

The getWindowHandles() command returns a list of ids corresponding to each window and on passing a particular window handle to the driver.switchTo().window(“{windowHandleName}”) command, we can switch control/focus to that particular window.

for (String windowHandle : driver.getWindowHandles()) {
     driver.switchTo().window(handle);
}