A measure of the amount of data that can be sent over a particular medium at a particular time, whether a telephone line, a dedicated data line, a satellite link, etc. The amount of bandwidth available determines the total capacity of the Internet to move data anywhere in the world, as well as the speed that data can be moved to an individual Internet user.
Text takes a relatively small amount of bandwidth.
Graphics, video, and sound require much larger amounts of bandwidth. The software used to access and view sites on the World Wide Web. The same e-mail can be sent easily to one address or to many addresses. E-mail is still the most commonly used Internet tool. It's fairly simple to set up and run an FTP server, and there are many FTP servers available for public use.