El GameObject es el concepto más importante en el Editor de Unity.
Every object in your game is a GameObject. This means that everything you can think of to be in your game has to be a GameObject. However, a GameObject can’t do anything on its own; you need to give it properties before it can become a character, an environment, or a special effect.
A GameObject is a container; you add pieces to the GameObject container to make it into a character, a light, a tree, a sound, or whatever else you would like it to be. Each piece you add is called a component.
Depending on what kind of object you want to create, you add different combinations of components to a GameObject. You can think of a GameObject as an empty cooking pot, and components as different ingredients that make up your recipe of gameplay. Unity has lots of different built-in component types, and you can also make your own components using the Unity Scripting API.