HDMI has become a staple in all of our home electronic systems -- we use it for our TVs, gaming consoles, monitors, DVD players, and more. Because so many devices rely on HDMI connections these days, we often find that we have too many HDMI cables and not enough ports to plug them in. This problem calls for HDMI splitters and switches. Although these devices are often referred to interchangeably, they serve different purposes. So, what's the difference and how do you know which one you need?