The most significant difference is that non-qualified dividends are taxed at the ordinary income tax rate while qualified dividends are taxed at capital gain tax rates.
On your 1099-DIV, the box 1a - ordinary dividends reflects the total dividend income received and box 1b - qualified dividends is the amount of the box 1a dividends that are qualified. Therefore, if your box 1a and 1b amounts were the same, then all of your dividend income would be treated as qualified.
