How driver.navigate().to() work on selenium in Selenium class? Means what is navigate() and to()?

I am confused with this. Basically when we create an object of a class, then we can access property or method. Up to I am fine. But what when we are creating an object of WebDriver class in Selenium and setting url through driver.navigate().to() . So Why are here two things navigate() and to() after the Selenium object driver.