How do I switch to an active window in Selenium?

To switch to an active window in Selenium, you can use the `driver.switchTo().window()` method in your code. This method allows you to navigate between multiple windows or tabs opened by the driver during the test.

Here is an example code snippet using Java:

```java
// Get the current window handle
String currentWindowHandle = driver.getWindowHandle();

// Get all window handles
Set allWindowHandles = driver.getWindowHandles();

// Iterate over all window handles and switch to the desired window
for (String windowHandle : allWindowHandles) {
if (!windowHandle.equals(currentWindowHandle)) {
driver.switchTo().window(windowHandle);
break;
}
}
```

By using the `driver.switchTo().window()` method and iterating through all window handles, you can effectively switch to an active window in Selenium.

Remember to ensure that you have identified the window you want to switch to correctly based on your test requirements.

Optimizing your Selenium test scripts to switch between windows using this method can improve the efficiency and reliability of your automated tests, enhancing the overall user experience.

Switching to an active window in Selenium is crucial for interacting with elements on different windows or tabs during your test scenarios, making it an essential functionality to master in your Selenium test automation projects.