What are different types of pop-ups you have handled in Selenium projects?

// Simple alert
Alert alert = driver.switchTo().alert();
alert.accept();  // Click OK

// Confirm dialog
Alert confirm = driver.switchTo().alert();
System.out.println(confirm.getText());
confirm.dismiss();  // Click Cancel

// Prompt dialog
Alert prompt = driver.switchTo().alert();
prompt.sendKeys("My input");
prompt.accept();

// Method 1: Embed in URL
driver.get("http://admin:password@the-internet.herokuapp.com/basic_auth");

// Method 2: Alert API
Alert alert = new WebDriverWait(driver, Duration.ofSeconds(10))
    .until(ExpectedConditions.alertIsPresent());
alert.authenticateUsing(new UserAndPassword("admin", "admin"));

// Get all window handles
String mainWindow = driver.getWindowHandle();
Set<String> handles = driver.getWindowHandles();

for (String handle : handles) {
    if (!handle.equals(mainWindow)) {
        driver.switchTo().window(handle);
        // Interact with popup window
        driver.close();
    }
}
driver.switchTo().window(mainWindow);

// Robot class for keyboard input on OS dialog
Robot robot = new Robot();
robot.keyPress(KeyEvent.VK_ENTER);  // Press Enter
robot.keyRelease(KeyEvent.VK_ENTER);

ChromeOptions options = new ChromeOptions();
options.addArguments("--disable-notifications");  // Block notification pop-ups
options.addArguments("--disable-popup-blocking");

// For file download — suppress download dialog
HashMap<String, Object> prefs = new HashMap<>();
prefs.put("download.prompt_for_download", false);
prefs.put("download.default_directory", "C:\\Downloads");
options.setExperimentalOption("prefs", prefs);