The TerrainThe landscape in your scene. A Terrain GameObject adds a large flat plane to your scene and you can use the Terrain’s Inspector window to create a detailed landscape. More info
See in Glossary system uses dedicated Unity engine resources to function correctly. Unity includes these resources in your application at build time when you have at least one Terrain instance in a sceneA Scene contains the environments and menus of your game. Think of each unique Scene file as a unique level. In each Scene, you place your environments, obstacles, and decorations, essentially designing and building your game in pieces. More info
See in Glossary that’s part of your build profileA set of customizable configuration settings to use when creating a build for your target platform. More info
See in Glossary.
If your application only creates Terrain instances at runtime, make sure you include at least one Terrain component as a placeholder in a scene listed by your build profile. Unity detects the placeholder and includes the required resources at build time.
Tip: If you’re not using the placeholder in your application, you can hide it. Either deactivate the GameObject that contains the Terrain component or put this GameObject in a scene that your application doesn’t load.