Internet bandwidth refers to the total speed at which data can be delivered to your computer or other internet-connected device. Bandwidth is usually expressed in “Megabits per second” (Mbps).
While bandwidth and speed aren't the same thing, they're closely related, which is why many people use the two terms interchangeably. The higher the bandwidth of service, the faster your connection speed will be on your devices (also measured in Mbps).
With high bandwidth, you can do more things online, faster, like download music, browse the internet, and stream video in HD. A low-bandwidth connection, on the other hand, may result in longer download and upload times, lower video quality, and buffering while streaming video or audio.