The next version of Apple's desktop operating system, macOS Sierra, will be made available in a public beta later today. Enthusiasts can also try their hands at iOS 10, the latest version of Apple's mobile operating system today. Both the new operating system versions offer a range of new features and improvements. Sierra, for instance, features Siri voice assistant which will assist users with locating files, answering queries, and search for images and information just by asking. iOS 10 lets users write a message in their own handwriting, and has a feature called "Raise to Wake" which wakes up the device when a user picks up their iPhone. Notifications have gotten more powerful, and now show photos and videos as well. You will find the macOS Sierra preview here , and iOS 10 preview here . More information on Apple's beta program here