The ways of using the Internet are many. It's a highly cost-effective business tool, and very flexible in its application. Fast changing industries such as the fashion business can gain immensely, by finding out about the latest trends, what the market is buying and being able to respond to it before their competitors.
Companies working on joint projects benefit too.
Imagine a magazine publisher with journalists in different towns. At present, each journalist types in the text, faxes or posts it to the office where it is passed to the sub-editor who amends it before it is retyped and made up into pages. No retyping or associated errors. No faxes being lost on peoples' desks. Nothing lost in the post or taking three days to get anywhere.