Email marketing is probably the best tool in the marketing arsenal for your online business. It’s extremely low-cost while remaining intensely effective. Compared to other marketing tools, email has the best ROI, up to 4400% ($44 for every $1 spent) and is 40 times more powerful than social media when it comes to conversions. Why is this so? Because your email goes directly into the inbox of your potential client. No need for the hassle of constantly trying to figure out ever-changing algorithms on both social media and search engines.