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Episode 9 explains the important component in the development of information technology, that is, communication. There are four important elements to be known before any form of communication can happen. These elements are message, sender, receiver and media. In this topic, you will realise that communication is a very important component of information technology. You will then focus more on data communication signals, that is, the analogue and digital signals, synchronous and asynchronous transmissions, simplex, half duplex, and full duplex lines, etc. At the end of this topic, you will be introduced on the various media for data transmission.