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Technology

Selenium

Difficulty

Beginner

Interview Question

What is Selenium?

Selenium is an open-source automation suite used to automate web browsers across multiple platforms and languages.

Answer

Selenium is a robust, open-source test automation suite used for automating web-based applications.

▸Key highlights
  • ✓Supports multiple browsers (Chrome, Firefox, Edge, Safari)
  • ✓Supports multiple programming languages ( Java, Python, C#, JavaScript)
  • ✓Works across multiple platforms (Windows, Mac, Linux)
  • ✓Completely free and open-source

Real-World Example

A QA team at an e-commerce company uses Selenium to automatically test their login, product search, and checkout flow across Chrome and Firefox - saving hours of manual testing every release.

Code Example

Java
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;

public class SeleniumDemo {
    public static void main(String[] args) {
        // Launch Chrome browser
        WebDriver driver = new ChromeDriver();
        
        // Open a website
        driver.get("https://www.google.com");
        
        System.out.println("Title: " + driver.getTitle());
        
        // Close browser
        driver.quit();
    }
}

Best Practices

  • ✓Always use Selenium WebDriver for production level automation
  • ✓Combine Selenium with frameworks like TestNG or JUnit for better test management

Common Mistakes

  • ✓Confusing Selenium IDE, Selenium WebDriver, and Selenium Grid
  • ✓Thinking Selenium can automate desktop or mobile apps ( it only supports web browsers across multiple)

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