Bit streaming and broadband
Streaming
Streaming, is when you click on a link to a video or song, for example. The video is sent to you from a specially set up 'streaming server' as opposed to a web server, and it sends you a part of the video at a time. That part then plays and while you are watching it, the second part is sent, and then played when the first part has finished. Part three is sent while you are watching part two, and so on. This continues until all the parts have been sent and played. As long as your Internet connection can download data fast enough (in other words, you have a high enough 'bandwidth'), you should be able to watch the video without it stopping or stop-starting all the time. If your Internet connection is slow, you may experience problems. When you have finished watching the video, you won't have a copy on your hard drive. If you want to watch it again, you have to click on the link and stream it again.
Bandwidth
Bandwidth is the term used to describe the volume of data that can be sent or received. It isn't the speed of data, but the amount of data, the volume of data.
If you think of a water pipe for a moment. A small diameter pipe will allow only so much water to flow through it. If you have a bigger diameter pipe, more water can pass through it. In both cases, the speed that the water travels is the same, it's just the volume of water that passes a particular point differs. The same idea can be applied to bandwidth. The better your Internet connection, the higher your bandwidth, and the more data you can send and receive. You always need a good Internet connection if you are downloading video, and certainly, you need a high bandwidth connection if you want to stream video. Broadband is excellent for this but a dial-up modem wouldn't be. If you are in a school with a lot of people streaming video or downloading music, then you need a very high bandwidth connection to the Internet.