On Tuesday, tech biggie Apple announced the launch of the third public beta of its newest desktop operating system --- macOS Sierra.

The release of the macOS Sierra public beta 3 by Apple comes a day after the launch of the fourth developer beta of the operating system, and two weeks after the release of its second public beta.

The macOS Sierra public beta 3 will be available to beta testers, who have signed up for Apple's beta testing program, via the Mac App Store’s Software Update mechanism. People interested in participating in Apple's beta testing program can sign up on the beta testing website, to gain access to both iOS and OS X betas.

The newly-launched third public beta of macOS Sierra offers the same features as the fourth developer beta of the software. Some of the most notable features common to the third public beta and the fourth developer beta of macOS Sierra include the introduction of more diverse emojis, as well as a refreshed look for a number of existing emojis.

The upcoming macOS Sierra marks a major update to Apple’s Mac operating system. The update will bring Apple’s Siri digital assistant to the Mac, to enable users to carry out voice searches to find files, look up information, and several other tasks. In addition, the update will also introduce new Continuity features to the Mac, including an ‘Auto Unlock’ option to allow users to unlock their Macs with an Apple Watch.