MacOS High Sierra

Building on the Mac's continuity features, Apple has introduced iOS-like features for the Mac.

Photos - Memories

Apple arranges photos in the form of "Memories," including instant video slideshows with soundtracks and titles.

Apple Pay

You can now use your iOS device to make payments online with Apple Pay.

Image: Apple, Inc

Universal Clipboard

With universal clipboard, you can copy any text or photo from your Mac and paste them to your iOS device, or vice versa. 

Siri

One of the biggest updates to the Mac is Siri integration. You can now use your favorite personal assistant to help you get things done on your Mac. Press the Siri icon in the top right corner or hold down the command/space keys. Issue any command and let Siri do her thing.

Siri can help you find images on the web. You can drag the image results right to the document you are working on.

Siri can help you send mail messages by locating people in your address book, adding a subject line, and crafting a message.

iCloud 

iCloud efficiency has been improved, providing iCloud back up support for your desktop files and documents folder - all of which perfectly synced across devices.

Apple Music

Apple Music now comes with a new re-design that makes that app easier to navigate, including a clean grid design and enhanced typography.