GameObjects are essentially every different item you put into your scene. If you have placed a teddy bear in your scene, this is a GameObject, or if you have a car, this is a GameObject too.
These GameObjects are like having an empty mug, but it only becomes useful when it has something to drink in it. GameObjects need Components to change them from a plain teddy bear, into a dancing, smiling teddy bear, or changing a shell of a car into a car you can actually drive with physics.
Lights in your scene work the same too; They are just a GameObject, which needs a component to make it a light.
So, anything you can dream up and create or add to your scene, is a GameObject. This Cube in scene is a GameObject as well.
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