Digital printing is just as same as how you print from your inkjet printer in your office or even your home. Digital printing uses a series of dots printed on top of the paper that form an image onto it.
Offset printing is done on large presses that use plates and ink. As your piece is printed on an offset press, the ink bleeds into the paper and bonds with it.
Because of the plates used, and the way the ink is absorbed by the paper, most people feel that offset printing provides deeper, richer, fuller color saturation than digital printing.
While digital printing has certainly improved over the years, most printing experts would agree that it still hasn’t reached the quality level of offset printing.
In contrast, we can sum it up with the following chart: