What Exactly Is Get Component - Unity Tutorial 

what do you mean? its for referencing a component in that object. do you know what a component is?

@@charperdove I don't understand how it's any better than doing. "NameHolder n = new NameHolder();" It just looks like unity made a glorified way of creating new instances but I've barely learned unity so I wouldn't know.

You don't know shit boy

​@@-Plube- You don't understand, at all. What you're "trying" to do is to create a new instance of NameHolder. What get component can do is get a reference to an existing NameHolder which is attached to the gameobject it is called for. The key here , is that the component already exists, and may have values and references assigned to it, rather than a blank new NameHolder instance. Also, you can't create instances of NameHolder as you're trying to do, with the new operator. NameHolder is a class inheriting monobehaviour which can only be created by AddComponent, or manually attaching it in inspector. GetComponent is particularly useful for prefab gameobjects that get instantiated at runtime. As there would be no other way to reference the components on them.