An ETF trades exactly like a stock does on the trading exchange, expect that the investment is made into a portfolio of securities. There could be as little as 20 or 30 different stocks within the ETF, or even hundreds. Right off the bat, a key advantage is that the investment is diversified among different stocks and sectors.
Before going out and purchasing a dividend ETF, I would recommend considering a few things first. The first would be the holdings within the ETF and the percentage of the positions. These is important because an ETF could have a large position in one stock, which could negatively affect your overall future returns.