Explain the difference between Selenium WebDriver and Selenium IDE.

Selenium IDE:

• Browser extension/plugin for record and playback
• No programming knowledge required
• Limited customization and control
• Good for simple, linear test cases
• Cannot handle complex scenarios like loops, conditions

Selenium WebDriver:

• Programming interface for browser automation
• Requires coding skills
• Full programmatic control over browser
• Supports multiple programming languages (Java, Python, C#, etc.)
• Can handle complex test scenarios and logic

// WebDriver example
WebDriver driver = new ChromeDriver();
driver.get("https://example.com");
WebElement element = driver.findElement(By.id("username"));
element.sendKeys("testuser");