To begin, a dividend is a sum of money paid by a company on regular intervals to its shareholders. A stock's dividend is calculated by totaling the annual sum of payouts made by the company and dividing that by the current stock price. This ratio is your dividend yield.
Companies that pay consistent dividends are usually less volatile than their cash-hoarding contemporaries. Throughout the course of the year, these value oriented businesses are run in such a way that they plan to return portions of their profits back to shareholders. Conversely, growth oriented companies take all of their profits and reinvest them directly back into the business for future expansion. Cases can be made for each side in deciding the winner of the value vs. growth stock preference, but the truth is that dividend payers typically outperform during bear markets and growth stocks typically outperform during bull markets (as seen in the graphs below).
Why now? Investors who still want to own stocks for the growth, but don't want as much volatility should be comfortable with dividend payers. However, this begs the question: are we still in a bear market, or are we entering a new bull market? The answer to that question should play a role in your current allocation.
Sources:
www.ritholtz.com