Unity Building Blocks are a starting point to quickly add functional features to your project. Each Building Block contains assets and scripts that give you an example of how a series of features work to achieve an outcome. You can download Building Blocks from the Asset Store.
The Multiplayer Session Building Block helps you integrate Unity’s multiplayer sessions into your project to connect players. This Building Block can serve as a starting point for your multiplayer projects, or as a quick integration of sessions throughout development.