Unity Multiplayer is the easiest way to create real-time, networked games for Unity. It’s fast to implement and highly customizable. Unity-provided servers ensure that your players can find and play with each other.
Note: If you are upgrading your multiplayer project from an earlier version of Unity (before 5.4), there a number of changes to the API which you may need to update in your project. For more information, see the 5.4 networking upgrade guide.