A dividend is a bonus. If you buy a cup of coffee and the shop owner throws in a free muffin, that's a dividend. Your charm and loyal patronage are paying dividends!
If you own stock and your company has had a good year, you’ll probably get a dividend — a share of the profit the company pays to shareholders. You've probably also heard the word dividend in math class: if you've got 300 divided by 50, 300 is the dividend (and 50 is the divisor).