A Dividend Reinvestment Plan, referred to as DRIP, is a plan offered by corporations that allows investors to reinvest their dividends in full or partial shares of additional stock, on the dividend payment date.
Accessing a DRIP is typically a good long-term investment play - it allows for the investor to repurchase shares at a discount to the share price, and by accumulating additional shares over time increases equity ownership in the company.
Of course, electing to participate in a DRIP means not receiving dividends in cash.