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Companies can see the Internet as a business opportunity – as a new advertising, communication, promotional or selling channel. Individuals can see the Internet as a mobile workplace. You can use office and multimedia applications directly on the Internet from any place in the world. You need only an Internet connection and some suitable appliance (e.g. smart phone, PDA , laptop or desktop in Internet café). The applications available on the Internet are called web applications or online applications. This article tries to summarise the most useful free application types that you can find on the World Wide Web.