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GetComponent() is a Unity method from the MonoBehaviour class that is used to access data on other components. To fully understand how this method works, you have to wrap your head around a few different concepts.
It is better to use GetComponent with a Type instead of a string for performance reasons. Sometimes you might not be able to get to the type however, for example when trying to access a C# script from Javascript. In that case you can simply access the component by name instead of type.