One inch border - yes - on all sides. The overall dimensions that are shown are the total size of what you are buying. If you are buying a framed print, then it includes the mat/frame. If you are buying a plain paper print, then it includes a 1" border all the way around. So a total of 2" more in width and height.
I suppose you could frame an 6x8 with the white border as the overall size would be standard, but if it's directly behind the glass, that's a risk that the print will eventually adhere to the glass without a mat.