To get a better understanding on it, one must see the architecture of Selenium WebDriver.
Just visit https://github.com/SeleniumHQ/selenium/wiki/JsonWireProtocol
and search for "Navigate to a new URL." text. You will see both methods GET and POST.
Hence the conclusion given below:
driver.get()driver.get() method internally sends Get request to Selenium Server Standalone. Whereas driver.navigate()driver.navigate() method sends Post request to Selenium Server Standalone.
Hope it helps