Selenium is a widely used tool for browser automation. It supports several languages like Java, Python, C#, and JavaScript. Selenium WebDriver lets you control a browser using code.

To get started, install the Selenium package using a language-specific package manager. For Python, use pip install selenium. You’ll also need a browser driver like ChromeDriver if you’re using Chrome.

Once installed, your script can open a browser, go to a webpage, find elements, click buttons, fill in forms, and verify content.

Here’s a basic example in Python:

from selenium import webdriver
browser = webdriver.Chrome()
browser.get('https://example.com')
assert "Example Domain" in browser.title
browser.quit()

This script opens Chrome, checks the page title, and closes the browser. You can build more complex tests from here. Selenium is flexible but may require more setup than newer tools.

Use Selenium when you need full control, support for many languages, or integration with existing frameworks. It’s battle-tested and widely supported.