Is the Finalizers disigned for releasing unmanaged resources?

Doc is https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/finalizers 

I mentioned that the description means finalizer is used to do some additional clean-up that the GC can't complete.

Now I am reading https://docs.microsoft.com/en-us/dotnet/standard/garbage-collection/implementing-dispose#implement-the-dispose-pattern documents.

After examining the example of docs, I found If I don't implement finalizer for class, it isn't neccessary for me to code the section of releasing unmanaged resource. So I think finalizer is used to free unmanaged resource when I have used reference of them directly inside the class.

If class doesn't refer unmanaged resource directly, it shouldn't exist in class.

If my opinion is inappropriate, leave your opnion please...