The Minecraft cross-platform play update dubbed "Better Together" is now live on a number of platforms.
For now the versions of Minecraft that will be able to benefit from this update include Minecraft's Windows 10, Android, iOS, Xbox One and VR versions. This means that everyone on these platforms can play together in what is basically one huge shared world. The update for Nintendo Switch is still being worked on and will be available sometime in the Winter.
It is worth noting that PlayStation players will not be a part of this update with no word on if it will happen for now. Developer Mojang are still in talks with Sony but for now it's a no go.