First, here's the long explanation: Broadband means the capacity for multiple signal transmission through a wide range of high-speed frequencies.
A mouthful, eh?
Now here's the short, and more impactful, explanation: Broadband equals high-speed Internet access.
How it works: A wide bandwidth transmission such as what broadband does can transport a large number of signals simultaneously via high-speed wired and wireless networks such as DSL, WiFi, cable, fiber, 3G, and 4G.
The result: Internet access is faster, always available, and keeping you smiling broadly all the time.