

Unity copies the assets you choose to include from the Unity install folder into your new project folder. When you create a new project in Unity, you can choose to include Standard Assets collections in your project. Asset>Import Package menu Standard Assets Do Not Upgrade Automatically

See Asset Packages for information about installing (importing) Standard Assets, as well as sharing Custom Packages between projects and via the Asset Store. Unity transfers Standard Assets into and out of projects using Unity packages. These are: 2D, Cameras, Characters, CrossPlatformInput, Effects, Environment, ParticleSystems, Prototyping, Utility, Vehicles.

These are collections of assets that are widely used by most Unity customers. Unity ships with multiple Standard Assets.
