Dividend reinvestment plans let you take advantage of the power of compounding. Instead of receiving cash dividends from the company, you may purchase more of a company's stock by having the dividends reinvested. You must sign an agreement with the company for this to be done. If you have a brokerage account or mutual fund, your firm may also have a dividend reinvestment plan. You should check with your firm or the company to see whether you will be charged for this service.