Question with Creating DataSets

[techmanbd]

I have been getting familiar with creating tables using dataset.xsd

 

I noticed something I had a question on. I create a table called "Model". inside the table I have partID to basically reference another table called "Part" which I make a primary key called partID.

 

So I know how to make a RELATION to the tables with a primary key and foriegn. What I did by accident, was when I dragged the "part" table over the "model" table it made an element based off that table "part"

 

Is this the same making a RELATION or something different?

 

Thanks. Hope I am clear. If not say so so I can try and make it clearer