What is Selenium, and why is it so popular in test automation?

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Selenium is an open-source automated testing framework used primarily for web applications. It allows developers and testers to simulate user interactions with a website—like clicking buttons, entering text, navigating pages—to ensure everything works as expected.

 What Exactly Is Selenium?

At its core, Selenium is a suite of tools, including:

  1. Selenium WebDriver: The most commonly used component. It interacts directly with the browser (Chrome, Firefox, etc.) to simulate user actions.

  2. Selenium IDE: A browser extension for recording and playing back tests—good for beginners or quick prototyping.

  3. Selenium Grid: Allows you to run tests across different machines and browsers in parallel (great for scaling up).

Why Is Selenium So Popular?

Here are the biggest reasons:

  1. Supports Multiple Languages
    You can write tests in Java, Python, C#, JavaScript, Ruby, and more.

  2. Cross-Browser Compatibility
    Works with Chrome, Firefox, Safari, Edge, etc.

  3. Platform Independent
    Runs on Windows, macOS, Linux—basically anywhere.

  4. Open Source & Free
    No licensing fees. Huge community support and lots of plugins/tools built around it.

  5. Integration Friendly
    Works well with tools like TestNG, JUnit, Jenkins, Maven, Docker, and CI/CD pipelines.

  6. Real Browser Testing
    Unlike some headless testing tools, Selenium can run tests in actual browsers—giving you more accurate results.


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