CommunicationsComputer communications is the process of sharing data, programs, andinformation between two or more computers. We have discussed numerousapplications that depend on communication systems, including• E-mail —provides a fast, efficient alternative to traditional mail by sendingand receiving electronic documents.• Instant messaging —supports direct, “live” electronic communicationbetween two or more friends or buddies.• Internet telephone —provides a very low-cost alternative to long-distancetelephone calls using electronic voice and video delivery.• Electronic commerce —buying and selling goods electronically.In this chapter, we will focus on the communication systems that supportthese and many other applications. Connectivity, the wireless revolution,and communication systems are key concepts and technologies for the 21stcentury
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