vb.net dataset vs datatable

what is the difference between a dataset and datatable?

also I have noticed that there are 2 ways you can do a dataset

actually create a dataset file and add your table scheme and then give the file a name

dim dataset1 as new myfilename

don't create a file and do this

dim dataset1 as new dataset

what is the difference on that?
Which is better to use?
So for I am actually creating the file so that this way I can link my crystal report files to it directly. Is that the purpose of it..

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