macOS Sierra is the 13th major release of macOS(previously OS X)and successor of OS X El Capiton. Introducing Siri to newly re-branded macOS for the first time along with dozens of new features, it came by default running macOS 10.12.1 Sierra.
Recently I purchased a brand new slim 13.3 inch Apple Mac Book Air with an amazing 1.6GHz dual-core Intel Core i5 processor.
