Andriod 9 or simply Andriod Pie launched in 2018 is the latest of andriod set of OS, and this latest updates comes with amazing features that you will definitely want to try out.
The update comes with more powerful artificial intelligence features like App Actions which is a new feature built into the App Drawer, suggesting actions based on your typical smartphone habits. So if you call your friends at the same time every day, expect a button to appear in the App Drawer that will directly start a call with her. If you plug in your headphones, App Actions may offer up a quick link to the playlist you were listening to earlier, saving you a few clicks.
Other AI powered feature includes slice which allows developers to deliver useful actions for their app, Other features are more background-focused. for example Adaptive Brightness which learns how you like your brightness in different surroundings, and automatically changing them to suit your personal preferences. Adaptive Battery is similar, learning which apps and services you really care about and making sure to supply maximum power to them, while limiting power usage of apps you don’t use as often
and some more features like
More Powerful Screen Lock
New ways to navigate your phone
Digital Wellbeing
and lots more
Although Andriod 9 is presently available on these the following phones
Pixel 2/Pixel 2 XL
Pixel/Pixel XL
Essential Phone
Sony Xperia XZ2
Sony Xperia XZ2 Premium
Xiaomi Mi Mix 2S
Nokia 7 Plus
Oppo R15 Pro
Vivo X21
OnePlus 6
so if you use any of these phones you are set or you wait till the final version and your phone is compatible to run the OS