Sean
To summarize, bandwidth is the amount of data that can be transferred per unit of time. Internet bandwidth is currently measured in units of Mbps, or million bits per second.
To firm up your understanding of bandwidth, imagine that on your home network your family streams video on multiple devices at the same time. As you can imagine, each stream of video requires a lot of data per second to keep the videos playing smoothly. If your streaming on more devices than your allotted bandwidth can support, you will start to hit your limit on how much data can be transferred and per second, and some of the devices will start buffering.
