What is the difference between driver.getWindowHandle() and driver.getWindowHandles() in Selenium WebDriver?

Question

What is the difference between driver.getWindowHandle() and driver.getWindowHandles() in Selenium WebDriver?

Answer

driver.getWindowHandle() is used to handle single window i.e. main window and driver.getWindowHandles() is used to handle multiple windows

driver.getWindowHandle() return type is string and driver.getWindowHandles() return type is Set.